74171920 has 20 divisors (see below), whose sum is σ = 172449900. Its totient is φ = 29668736.

The previous prime is 74171899. The next prime is 74171921. The reversal of 74171920 is 2917147.

It can be written as a sum of positive squares in 2 ways, for example, as 48608784 + 25563136 = 6972^2 + 5056^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (74171921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463495 + ... + 463654.

It is an arithmetic number, because the mean of its divisors is an integer number (8622495).

Almost surely, 2^74171920 is an apocalyptic number.

It is an amenable number.

74171920 is an abundant number, since it is smaller than the sum of its proper divisors (98277980).

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

74171920 is a wasteful number, since it uses less digits than its factorization.

74171920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927162 (or 927156 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 74171920 is about 8612.3121169637. The cubic root of 74171920 is about 420.1585191503.

The spelling of 74171920 in words is "seventy-four million, one hundred seventy-one thousand, nine hundred twenty".