645615234 has 24 divisors (see below), whose sum is σ = 1526000112. Its totient is φ = 195640920.

The previous prime is 645615211. The next prime is 645615247. The reversal of 645615234 is 432516546.

645615234 is a `hidden beast` number, since 6 + 4 + 5 + 615 + 2 + 34 = 666.

645615234 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1630144 + ... + 1630539.

It is an arithmetic number, because the mean of its divisors is an integer number (63583338).

Almost surely, 2^645615234 is an apocalyptic number.

645615234 is an abundant number, since it is smaller than the sum of its proper divisors (880384878).

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

645615234 is a wasteful number, since it uses less digits than its factorization.

645615234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260702 (or 3260699 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 645615234 is about 25408.9597189653. The cubic root of 645615234 is about 864.2868855052.

The spelling of 645615234 in words is "six hundred forty-five million, six hundred fifteen thousand, two hundred thirty-four".