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64490 = 256449
BaseRepresentation
bin1111101111101010
310021110112
433233222
54030430
61214322
7356006
oct175752
9107415
1064490
11444a8
12313a2
132347a
1419706
1514195
hexfbea

64490 has 8 divisors (see below), whose sum is σ = 116100. Its totient is φ = 25792.

The previous prime is 64489. The next prime is 64499. The reversal of 64490 is 9446.

It can be written as a sum of positive squares in 2 ways, for example, as 61009 + 3481 = 247^2 + 59^2 .

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

It is a Curzon number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (64499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3215 + ... + 3234.

264490 is an apocalyptic number.

64490 is a deficient number, since it is larger than the sum of its proper divisors (51610).

64490 is a wasteful number, since it uses less digits than its factorization.

64490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6456.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 64490 is about 253.9488137401. The cubic root of 64490 is about 40.1018239107.

The spelling of 64490 in words is "sixty-four thousand, four hundred ninety".

Divisors: 1 2 5 10 6449 12898 32245 64490