647246988 has 36 divisors (see below), whose sum is σ = 1638746928. Its totient is φ = 215399520.

The previous prime is 647246987. The next prime is 647247043. The reversal of 647246988 is 889642746.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (647246983) 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, 8470 + ... + 36962.

It is an arithmetic number, because the mean of its divisors is an integer number (45520748).

Almost surely, 2^647246988 is an apocalyptic number.

It is an amenable number.

647246988 is an abundant number, since it is smaller than the sum of its proper divisors (991499940).

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

647246988 is a wasteful number, since it uses less digits than its factorization.

647246988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29134 (or 29129 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 647246988 is about 25441.0492708143. The cubic root of 647246988 is about 865.0144174371.

The spelling of 647246988 in words is "six hundred forty-seven million, two hundred forty-six thousand, nine hundred eighty-eight".