921320928 has 72 divisors (see below), whose sum is σ = 2858198616. Its totient is φ = 279187200.

The previous prime is 921320903. The next prime is 921320941. The reversal of 921320928 is 829023129.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 921320892 and 921320901.

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 11 ways as a sum of consecutive naturals, for example, 142243 + ... + 148578.

It is an arithmetic number, because the mean of its divisors is an integer number (39697203).

Almost surely, 2^921320928 is an apocalyptic number.

It is an amenable number.

921320928 is an abundant number, since it is smaller than the sum of its proper divisors (1936877688).

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

921320928 is a wasteful number, since it uses less digits than its factorization.

921320928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290848 (or 290837 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 921320928 is about 30353.2688190251. The cubic root of 921320928 is about 973.0540818130.

The spelling of 921320928 in words is "nine hundred twenty-one million, three hundred twenty thousand, nine hundred twenty-eight".