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664008397 = 13197259277
BaseRepresentation
bin100111100100111…
…111011011001101
31201021110010021121
4213210333123031
52324441232042
6145520000541
722311656353
oct4744773315
91637403247
10664008397
113108a7378
12166460151
13a774a1a0
14642897d3
153d463367
hex2793f6cd

664008397 has 8 divisors (see below), whose sum is σ = 718718616. Its totient is φ = 609817152.

The previous prime is 664008353. The next prime is 664008403. The reversal of 664008397 is 793800466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 397045476 + 266962921 = 19926^2 + 16339^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664008397 - 215 = 663975629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664008307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127078 + ... + 132199.

It is an arithmetic number, because the mean of its divisors is an integer number (89839827).

Almost surely, 2664008397 is an apocalyptic number.

It is an amenable number.

664008397 is a deficient number, since it is larger than the sum of its proper divisors (54710219).

664008397 is a wasteful number, since it uses less digits than its factorization.

664008397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259487.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 664008397 is about 25768.3603863342. The cubic root of 664008397 is about 872.4178118164.

The spelling of 664008397 in words is "six hundred sixty-four million, eight thousand, three hundred ninety-seven".

Divisors: 1 13 197 2561 259277 3370601 51077569 664008397