66921932 has 96 divisors (see below), whose sum is σ = 155172864. Its totient is φ = 24494400.

The previous prime is 66921931. The next prime is 66921961. The reversal of 66921932 is 23912966.

It is a super-2 number, since 2×66921932² = 8957089965225248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66921931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 410483 + ... + 410645.

It is an arithmetic number, because the mean of its divisors is an integer number (1616384).

Almost surely, 2^66921932 is an apocalyptic number.

66921932 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66921932, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77586432).

66921932 is an abundant number, since it is smaller than the sum of its proper divisors (88250932).

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

66921932 is a wasteful number, since it uses less digits than its factorization.

66921932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259 (or 257 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 66921932 is about 8180.5826198383. The cubic root of 66921932 is about 405.9969990152.

The spelling of 66921932 in words is "sixty-six million, nine hundred twenty-one thousand, nine hundred thirty-two".