647022988 has 6 divisors (see below), whose sum is σ = 1132290236. Its totient is φ = 323511492.

The previous prime is 647022977. The next prime is 647022991. The reversal of 647022988 is 889220746.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80877870 + ... + 80877877.

Almost surely, 2^647022988 is an apocalyptic number.

It is an amenable number.

647022988 is a deficient number, since it is larger than the sum of its proper divisors (485267248).

647022988 is a wasteful number, since it uses less digits than its factorization.

647022988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161755751 (or 161755749 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 647022988 is about 25436.6465557078. The cubic root of 647022988 is about 864.9146175204.

The spelling of 647022988 in words is "six hundred forty-seven million, twenty-two thousand, nine hundred eighty-eight".