921375072 has 72 divisors (see below), whose sum is σ = 2635987536. Its totient is φ = 305270016.

The previous prime is 921375019. The next prime is 921375137. The reversal of 921375072 is 270573129.

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38518 + ... + 57674.

It is an arithmetic number, because the mean of its divisors is an integer number (36610938).

Almost surely, 2^921375072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 921375072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317993768).

921375072 is an abundant number, since it is smaller than the sum of its proper divisors (1714612464).

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

921375072 is a wasteful number, since it uses less digits than its factorization.

921375072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19340 (or 19329 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 921375072 is about 30354.1607032710. The cubic root of 921375072 is about 973.0731428541.

The spelling of 921375072 in words is "nine hundred twenty-one million, three hundred seventy-five thousand, seventy-two".