921816672 has 96 divisors (see below), whose sum is σ = 2772000000. Its totient is φ = 262752768.

The previous prime is 921816667. The next prime is 921816677. The reversal of 921816672 is 276618129.

It is an interprime number because it is at equal distance from previous prime (921816667) and next prime (921816677).

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921816677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 333954 + ... + 336702.

It is an arithmetic number, because the mean of its divisors is an integer number (28875000).

Almost surely, 2^921816672 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 921816672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386000000).

921816672 is an abundant number, since it is smaller than the sum of its proper divisors (1850183328).

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

921816672 is a wasteful number, since it uses less digits than its factorization.

921816672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268 (or 3260 counting only the distinct ones).

The product of its digits is 72576, while the sum is 42.

The square root of 921816672 is about 30361.4339582306. The cubic root of 921816672 is about 973.2285773709.

The spelling of 921816672 in words is "nine hundred twenty-one million, eight hundred sixteen thousand, six hundred seventy-two".