645464015 has 24 divisors (see below), whose sum is σ = 904362912. Its totient is φ = 440959680.

The previous prime is 645464011. The next prime is 645464021. The reversal of 645464015 is 510464546.

It is not a de Polignac number, because 645464015 - 2² = 645464011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645464011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63110 + ... + 72620.

It is an arithmetic number, because the mean of its divisors is an integer number (37681788).

Almost surely, 2^645464015 is an apocalyptic number.

645464015 is a deficient number, since it is larger than the sum of its proper divisors (258898897).

645464015 is a wasteful number, since it uses less digits than its factorization.

645464015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9807 (or 9800 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 645464015 is about 25405.9838423943. The cubic root of 645464015 is about 864.2194011393.

The spelling of 645464015 in words is "six hundred forty-five million, four hundred sixty-four thousand, fifteen".