212664474 has 64 divisors (see below), whose sum is σ = 519183360. Its totient is φ = 63990000.

The previous prime is 212664467. The next prime is 212664479. The reversal of 212664474 is 474466212.

212664474 is a `hidden beast` number, since 2 + 1 + 2 + 6 + 644 + 7 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (212664479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88509 + ... + 90879.

It is an arithmetic number, because the mean of its divisors is an integer number (8112240).

Almost surely, 2^212664474 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212664474, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259591680).

212664474 is an abundant number, since it is smaller than the sum of its proper divisors (306518886).

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

212664474 is a wasteful number, since it uses less digits than its factorization.

212664474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2544 (or 2538 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 212664474 is about 14583.0200575875. The cubic root of 212664474 is about 596.8955146554.

The spelling of 212664474 in words is "two hundred twelve million, six hundred sixty-four thousand, four hundred seventy-four".