647962920 has 96 divisors (see below), whose sum is σ = 2297337120. Its totient is φ = 157080960.

The previous prime is 647962919. The next prime is 647962927. The reversal of 647962920 is 29269746.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (647962927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77854 + ... + 85773.

It is an arithmetic number, because the mean of its divisors is an integer number (23930595).

Almost surely, 2^647962920 is an apocalyptic number.

647962920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647962920 is an abundant number, since it is smaller than the sum of its proper divisors (1649374200).

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

647962920 is a wasteful number, since it uses less digits than its factorization.

647962920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163655 (or 163648 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 647962920 is about 25455.1157923118. The cubic root of 647962920 is about 865.3332361245. Note that the first 3 decimals are identical.

The spelling of 647962920 in words is "six hundred forty-seven million, nine hundred sixty-two thousand, nine hundred twenty".