645614004 has 36 divisors (see below), whose sum is σ = 1752382464. Its totient is φ = 184460976.

The previous prime is 645613961. The next prime is 645614009. The reversal of 645614004 is 400416546.

It is a super-3 number, since 3×645614004³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645614009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 548404 + ... + 549579.

Almost surely, 2^645614004 is an apocalyptic number.

It is an amenable number.

645614004 is an abundant number, since it is smaller than the sum of its proper divisors (1106768460).

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

645614004 is a wasteful number, since it uses less digits than its factorization.

645614004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1098004 (or 1097995 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 645614004 is about 25408.9355148932. The cubic root of 645614004 is about 864.2863366367.

The spelling of 645614004 in words is "six hundred forty-five million, six hundred fourteen thousand, four".