645089515 has 32 divisors (see below), whose sum is σ = 900956160. Its totient is φ = 434294784.

The previous prime is 645089513. The next prime is 645089521. The reversal of 645089515 is 515980546.

It is not a de Polignac number, because 645089515 - 2¹ = 645089513 is a prime.

It is a super-2 number, since 2×645089515² = 832280964725870450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645089513) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 457131 + ... + 458539.

It is an arithmetic number, because the mean of its divisors is an integer number (28154880).

Almost surely, 2^645089515 is an apocalyptic number.

645089515 is a deficient number, since it is larger than the sum of its proper divisors (255866645).

645089515 is a wasteful number, since it uses less digits than its factorization.

645089515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1651.

The product of its (nonzero) digits is 216000, while the sum is 43.

The square root of 645089515 is about 25398.6124621012. The cubic root of 645089515 is about 864.0522279778.

The spelling of 645089515 in words is "six hundred forty-five million, eighty-nine thousand, five hundred fifteen".