645015436 has 12 divisors (see below), whose sum is σ = 1215606112. Its totient is φ = 297699408.

The previous prime is 645015431. The next prime is 645015467. The reversal of 645015436 is 634510546.

It is not an unprimeable number, because it can be changed into a prime (645015431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6202020 + ... + 6202123.

Almost surely, 2^645015436 is an apocalyptic number.

It is an amenable number.

645015436 is a deficient number, since it is larger than the sum of its proper divisors (570590676).

645015436 is a wasteful number, since it uses less digits than its factorization.

645015436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12404160 (or 12404158 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 645015436 is about 25397.1540925356. The cubic root of 645015436 is about 864.0191521675.

The spelling of 645015436 in words is "six hundred forty-five million, fifteen thousand, four hundred thirty-six".