647428446 has 24 divisors (see below), whose sum is σ = 1603156464. Its totient is φ = 184979520.

The previous prime is 647428433. The next prime is 647428471. The reversal of 647428446 is 644824746.

It is a congruent number.

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, 2569035 + ... + 2569286.

It is an arithmetic number, because the mean of its divisors is an integer number (66798186).

Almost surely, 2^647428446 is an apocalyptic number.

647428446 is an abundant number, since it is smaller than the sum of its proper divisors (955728018).

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

647428446 is a wasteful number, since it uses less digits than its factorization.

647428446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5138336 (or 5138333 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 45.

The square root of 647428446 is about 25444.6152653169. The cubic root of 647428446 is about 865.0952465090.

The spelling of 647428446 in words is "six hundred forty-seven million, four hundred twenty-eight thousand, four hundred forty-six".