647074820 has 24 divisors (see below), whose sum is σ = 1552979904. Its totient is φ = 221854176.

The previous prime is 647074807. The next prime is 647074823. The reversal of 647074820 is 28470746.

It is not an unprimeable number, because it can be changed into a prime (647074823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2310842 + ... + 2311121.

It is an arithmetic number, because the mean of its divisors is an integer number (64707496).

Almost surely, 2^647074820 is an apocalyptic number.

It is an amenable number.

647074820 is an abundant number, since it is smaller than the sum of its proper divisors (905905084).

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

647074820 is a wasteful number, since it uses less digits than its factorization.

647074820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4621979 (or 4621977 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 647074820 is about 25437.6653802978. The cubic root of 647074820 is about 864.9377125563.

The spelling of 647074820 in words is "six hundred forty-seven million, seventy-four thousand, eight hundred twenty".