645754056 has 128 divisors (see below), whose sum is σ = 1736294400. Its totient is φ = 199779840.

The previous prime is 645754033. The next prime is 645754063. The reversal of 645754056 is 650457546.

It is a super-2 number, since 2×645754056² = 833996601680902272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645753999 and 645754017.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2062956 + ... + 2063268.

It is an arithmetic number, because the mean of its divisors is an integer number (13564800).

Almost surely, 2^645754056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645754056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868147200).

645754056 is an abundant number, since it is smaller than the sum of its proper divisors (1090540344).

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

645754056 is a wasteful number, since it uses less digits than its factorization.

645754056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 42.

The square root of 645754056 is about 25411.6913250574. The cubic root of 645754056 is about 864.3488281965.

The spelling of 645754056 in words is "six hundred forty-five million, seven hundred fifty-four thousand, fifty-six".