645515436 has 24 divisors (see below), whose sum is σ = 1506662640. Its totient is φ = 215106112.

The previous prime is 645515413. The next prime is 645515459. The reversal of 645515436 is 634515546.

645515436 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645515413) and next prime (645515459).

It is a super-2 number, since 2×645515436² = 833380356228540192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645515394 and 645515403.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48250 + ... + 60158.

It is an arithmetic number, because the mean of its divisors is an integer number (62777610).

Almost surely, 2^645515436 is an apocalyptic number.

It is an amenable number.

645515436 is an abundant number, since it is smaller than the sum of its proper divisors (861147204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645515436 is a wasteful number, since it uses less digits than its factorization.

645515436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16433 (or 16431 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

The square root of 645515436 is about 25406.9958082415. The cubic root of 645515436 is about 864.2423499249.

The spelling of 645515436 in words is "six hundred forty-five million, five hundred fifteen thousand, four hundred thirty-six".