645321246 has 8 divisors (see below), whose sum is σ = 1290642504. Its totient is φ = 215107080.

The previous prime is 645321223. The next prime is 645321247. The reversal of 645321246 is 642123546.

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

645321246 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645321247) 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, 53776765 + ... + 53776776.

It is an arithmetic number, because the mean of its divisors is an integer number (161330313).

Almost surely, 2^645321246 is an apocalyptic number.

645321246 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645321246 is a wasteful number, since it uses less digits than its factorization.

645321246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107553546.

The product of its digits is 34560, while the sum is 33.

The square root of 645321246 is about 25403.1739355538. The cubic root of 645321246 is about 864.1556780735.

The spelling of 645321246 in words is "six hundred forty-five million, three hundred twenty-one thousand, two hundred forty-six".