647407904 has 72 divisors (see below), whose sum is σ = 1505779632. Its totient is φ = 271614720.

The previous prime is 647407903. The next prime is 647407927. The reversal of 647407904 is 409704746.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (647407903) 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, 54047 + ... + 64929.

It is an arithmetic number, because the mean of its divisors is an integer number (20913606).

Almost surely, 2^647407904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647407904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752889816).

647407904 is an abundant number, since it is smaller than the sum of its proper divisors (858371728).

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

647407904 is a wasteful number, since it uses less digits than its factorization.

647407904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10930 (or 10909 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 647407904 is about 25444.2116010695. The cubic root of 647407904 is about 865.0860969911.

The spelling of 647407904 in words is "six hundred forty-seven million, four hundred seven thousand, nine hundred four".