647253216 has 72 divisors (see below), whose sum is σ = 1900027584. Its totient is φ = 208788480.

The previous prime is 647253203. The next prime is 647253251. The reversal of 647253216 is 612352746.

647253216 is a `hidden beast` number, since 647 + 2 + 5 + 3 + 2 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27321 + ... + 45176.

It is an arithmetic number, because the mean of its divisors is an integer number (26389272).

Almost surely, 2^647253216 is an apocalyptic number.

It is an amenable number.

647253216 is an abundant number, since it is smaller than the sum of its proper divisors (1252774368).

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

647253216 is a wasteful number, since it uses less digits than its factorization.

647253216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72544 (or 72533 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 647253216 is about 25441.1716711318. The cubic root of 647253216 is about 865.0171919022.

The spelling of 647253216 in words is "six hundred forty-seven million, two hundred fifty-three thousand, two hundred sixteen".