645154736 has 10 divisors (see below), whose sum is σ = 1249987332. Its totient is φ = 322577360.

The previous prime is 645154723. The next prime is 645154751. The reversal of 645154736 is 637451546.

It is a junction number, because it is equal to n+sod(n) for n = 645154693 and 645154702.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20161070 + ... + 20161101.

Almost surely, 2^645154736 is an apocalyptic number.

It is an amenable number.

645154736 is a deficient number, since it is larger than the sum of its proper divisors (604832596).

645154736 is a wasteful number, since it uses less digits than its factorization.

645154736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40322179 (or 40322173 counting only the distinct ones).

The product of its digits is 302400, while the sum is 41.

The square root of 645154736 is about 25399.8963777414. The cubic root of 645154736 is about 864.0813466504.

The spelling of 645154736 in words is "six hundred forty-five million, one hundred fifty-four thousand, seven hundred thirty-six".