645554604 has 12 divisors (see below), whose sum is σ = 1506294104. Its totient is φ = 215184864.

The previous prime is 645554603. The next prime is 645554669. The reversal of 645554604 is 406455546.

645554604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (645554603) 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, 26898097 + ... + 26898120.

Almost surely, 2^645554604 is an apocalyptic number.

It is an amenable number.

645554604 is an abundant number, since it is smaller than the sum of its proper divisors (860739500).

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

645554604 is a wasteful number, since it uses less digits than its factorization.

645554604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53796224 (or 53796222 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

The square root of 645554604 is about 25407.7666078701. The cubic root of 645554604 is about 864.2598294758.

The spelling of 645554604 in words is "six hundred forty-five million, five hundred fifty-four thousand, six hundred four".