847639680 has 64 divisors (see below), whose sum is σ = 2701857600. Its totient is φ = 226036736.

The previous prime is 847639679. The next prime is 847639717. The reversal of 847639680 is 86936748.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×847639680² = 1436986054221004800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218820 + ... + 222659.

It is an arithmetic number, because the mean of its divisors is an integer number (42216525).

Almost surely, 2^847639680 is an apocalyptic number.

847639680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

847639680 is an abundant number, since it is smaller than the sum of its proper divisors (1854217920).

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

847639680 is a wasteful number, since it uses less digits than its factorization.

847639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441501 (or 441489 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 847639680 is about 29114.2521799891. The cubic root of 847639680 is about 946.3906180064.

The spelling of 847639680 in words is "eight hundred forty-seven million, six hundred thirty-nine thousand, six hundred eighty".