420644756 has 12 divisors (see below), whose sum is σ = 841289568. Its totient is φ = 180276312.

The previous prime is 420644717. The next prime is 420644767. The reversal of 420644756 is 657446024.

420644756 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7511486 + ... + 7511541.

It is an arithmetic number, because the mean of its divisors is an integer number (70107464).

Almost surely, 2^420644756 is an apocalyptic number.

It is an amenable number.

420644756 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

420644756 is a wasteful number, since it uses less digits than its factorization.

420644756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15023038 (or 15023036 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 38.

The square root of 420644756 is about 20509.6259351554. The cubic root of 420644756 is about 749.2702567151.

The spelling of 420644756 in words is "four hundred twenty million, six hundred forty-four thousand, seven hundred fifty-six".