74921920 has 28 divisors (see below), whose sum is σ = 178408584. Its totient is φ = 29968640.

The previous prime is 74921911. The next prime is 74921933. The reversal of 74921920 is 2912947.

It is a happy number.

It is a super-2 number, since 2×74921920² = 11226588192972800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116746 + ... + 117385.

Almost surely, 2^74921920 is an apocalyptic number.

It is an amenable number.

74921920 is an abundant number, since it is smaller than the sum of its proper divisors (103486664).

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

74921920 is a wasteful number, since it uses less digits than its factorization.

74921920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234148 (or 234138 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 74921920 is about 8655.7449130621. The cubic root of 74921920 is about 421.5699368976.

The spelling of 74921920 in words is "seventy-four million, nine hundred twenty-one thousand, nine hundred twenty".