212615664 has 20 divisors (see below), whose sum is σ = 549257256. Its totient is φ = 70871872.

The previous prime is 212615647. The next prime is 212615671. The reversal of 212615664 is 466516212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2214699 + ... + 2214794.

Almost surely, 2^212615664 is an apocalyptic number.

212615664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

212615664 is an abundant number, since it is smaller than the sum of its proper divisors (336641592).

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

212615664 is a wasteful number, since it uses less digits than its factorization.

212615664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429504 (or 4429498 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 212615664 is about 14581.3464398868. The cubic root of 212615664 is about 596.8498453769.

The spelling of 212615664 in words is "two hundred twelve million, six hundred fifteen thousand, six hundred sixty-four".