645752046 has 16 divisors (see below), whose sum is σ = 1326410064. Its totient is φ = 209433024.

The previous prime is 645752033. The next prime is 645752101. The reversal of 645752046 is 640257546.

It is a super-2 number, since 2×645752046² = 833991409826372232, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645751995 and 645752013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454175 + ... + 1454618.

It is an arithmetic number, because the mean of its divisors is an integer number (82900629).

Almost surely, 2^645752046 is an apocalyptic number.

645752046 is an abundant number, since it is smaller than the sum of its proper divisors (680658018).

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

645752046 is a wasteful number, since it uses less digits than its factorization.

645752046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2908835.

The product of its (nonzero) digits is 201600, while the sum is 39.

The square root of 645752046 is about 25411.6517763014. The cubic root of 645752046 is about 864.3479313933.

The spelling of 645752046 in words is "six hundred forty-five million, seven hundred fifty-two thousand, forty-six".