921748860 has 72 divisors (see below), whose sum is σ = 2861018160. Its totient is φ = 240081408.

The previous prime is 921748813. The next prime is 921748871. The reversal of 921748860 is 68847129.

921748860 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×921748860² = 1699241921822599200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 51805 + ... + 67284.

Almost surely, 2^921748860 is an apocalyptic number.

921748860 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

921748860 is an abundant number, since it is smaller than the sum of its proper divisors (1939269300).

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

921748860 is a wasteful number, since it uses less digits than its factorization.

921748860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119147 (or 119142 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 921748860 is about 30360.3171920189. The cubic root of 921748860 is about 973.2047121069.

The spelling of 921748860 in words is "nine hundred twenty-one million, seven hundred forty-eight thousand, eight hundred sixty".