921910864 has 20 divisors (see below), whose sum is σ = 2041374304. Its totient is φ = 395104608.

The previous prime is 921910807. The next prime is 921910879. The reversal of 921910864 is 468019129.

It is a super-2 number, since 2×921910864² = 1699839282322452992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4115562 + ... + 4115785.

Almost surely, 2^921910864 is an apocalyptic number.

It is an amenable number.

921910864 is an abundant number, since it is smaller than the sum of its proper divisors (1119463440).

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

921910864 is a wasteful number, since it uses less digits than its factorization.

921910864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231362 (or 8231356 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 921910864 is about 30362.9850969894. The cubic root of 921910864 is about 973.2617246791.

The spelling of 921910864 in words is "nine hundred twenty-one million, nine hundred ten thousand, eight hundred sixty-four".