645015896 has 32 divisors (see below), whose sum is σ = 1395874080. Its totient is φ = 273696000.

The previous prime is 645015871. The next prime is 645015911. The reversal of 645015896 is 698510546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51365 + ... + 62676.

It is an arithmetic number, because the mean of its divisors is an integer number (43621065).

Almost surely, 2^645015896 is an apocalyptic number.

It is an amenable number.

645015896 is an abundant number, since it is smaller than the sum of its proper divisors (750858184).

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

645015896 is a wasteful number, since it uses less digits than its factorization.

645015896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114155 (or 114151 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 645015896 is about 25397.1631486668. The cubic root of 645015896 is about 864.0193575624.

The spelling of 645015896 in words is "six hundred forty-five million, fifteen thousand, eight hundred ninety-six".