645515392 has 32 divisors (see below), whose sum is σ = 1290255120. Its totient is φ = 321686784.

The previous prime is 645515383. The next prime is 645515407. The reversal of 645515392 is 293515546.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×645515392³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31083 + ... + 47509.

Almost surely, 2^645515392 is an apocalyptic number.

It is an amenable number.

645515392 is a deficient number, since it is larger than the sum of its proper divisors (644739728).

645515392 is a wasteful number, since it uses less digits than its factorization.

645515392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16748 (or 16736 counting only the distinct ones).

The product of its digits is 162000, while the sum is 40.

The square root of 645515392 is about 25406.9949423382. The cubic root of 645515392 is about 864.2423302885.

The spelling of 645515392 in words is "six hundred forty-five million, five hundred fifteen thousand, three hundred ninety-two".