74531820 has 48 divisors (see below), whose sum is σ = 227662848. Its totient is φ = 18068160.

The previous prime is 74531797. The next prime is 74531861. The reversal of 74531820 is 2813547.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55804 + ... + 57123.

It is an arithmetic number, because the mean of its divisors is an integer number (4742976).

Almost surely, 2^74531820 is an apocalyptic number.

It is an amenable number.

74531820 is an abundant number, since it is smaller than the sum of its proper divisors (153131028).

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

74531820 is a wasteful number, since it uses less digits than its factorization.

74531820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112950 (or 112948 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 74531820 is about 8633.1813371433. The cubic root of 74531820 is about 420.8369930299.

The spelling of 74531820 in words is "seventy-four million, five hundred thirty-one thousand, eight hundred twenty".