211908864 has 36 divisors (see below), whose sum is σ = 563988656. Its totient is φ = 70636032.

The previous prime is 211908863. The next prime is 211908871. The reversal of 211908864 is 468809112.

It is not an unprimeable number, because it can be changed into a prime (211908863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137194 + ... + 138729.

Almost surely, 2^211908864 is an apocalyptic number.

211908864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

211908864 is an abundant number, since it is smaller than the sum of its proper divisors (352079792).

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

211908864 is an equidigital number, since it uses as much as digits as its factorization.

211908864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275942 (or 275928 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 211908864 is about 14557.0898190538. The cubic root of 211908864 is about 596.1877402039.

The spelling of 211908864 in words is "two hundred eleven million, nine hundred eight thousand, eight hundred sixty-four".