645009015 has 32 divisors (see below), whose sum is σ = 1188080640. Its totient is φ = 292702464.

The previous prime is 645008999. The next prime is 645009037. The reversal of 645009015 is 510900546.

It is not a de Polignac number, because 645009015 - 2⁴ = 645008999 is a prime.

It is a congruent number.

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, 8035 + ... + 36804.

It is an arithmetic number, because the mean of its divisors is an integer number (37127520).

Almost surely, 2^645009015 is an apocalyptic number.

645009015 is a deficient number, since it is larger than the sum of its proper divisors (543071625).

645009015 is a wasteful number, since it uses less digits than its factorization.

645009015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44991.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 645009015 is about 25397.0276804196. The cubic root of 645009015 is about 864.0162851119.

The spelling of 645009015 in words is "six hundred forty-five million, nine thousand, fifteen".