645079015 has 16 divisors (see below), whose sum is σ = 897887232. Its totient is φ = 435736224.

The previous prime is 645078971. The next prime is 645079033. The reversal of 645079015 is 510970546.

It is not a de Polignac number, because 645079015 - 2⁷ = 645078887 is a prime.

It is a super-2 number, since 2×645079015² = 832253871186740450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135199 + ... + 139888.

It is an arithmetic number, because the mean of its divisors is an integer number (56117952).

Almost surely, 2^645079015 is an apocalyptic number.

645079015 is a deficient number, since it is larger than the sum of its proper divisors (252808217).

645079015 is a wasteful number, since it uses less digits than its factorization.

645079015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275166.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 645079015 is about 25398.4057570549. The cubic root of 645079015 is about 864.0475399475.

The spelling of 645079015 in words is "six hundred forty-five million, seventy-nine thousand, fifteen".