212561764 has 24 divisors (see below), whose sum is σ = 385680960. Its totient is φ = 102383904.

The previous prime is 212561731. The next prime is 212561773. The reversal of 212561764 is 467165212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56527 + ... + 60169.

It is an arithmetic number, because the mean of its divisors is an integer number (16070040).

Almost surely, 2^212561764 is an apocalyptic number.

It is an amenable number.

212561764 is a deficient number, since it is larger than the sum of its proper divisors (173119196).

212561764 is a wasteful number, since it uses less digits than its factorization.

212561764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179 (or 4177 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 212561764 is about 14579.4980709214. The cubic root of 212561764 is about 596.7994054972.

The spelling of 212561764 in words is "two hundred twelve million, five hundred sixty-one thousand, seven hundred sixty-four".