74538820 has 24 divisors (see below), whose sum is σ = 160351128. Its totient is φ = 29088000.

The previous prime is 74538817. The next prime is 74538847. The reversal of 74538820 is 2883547.

It can be written as a sum of positive squares in 4 ways, for example, as 2050624 + 72488196 = 1432^2 + 8514^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 74538820.

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 7 ways as a sum of consecutive naturals, for example, 44631 + ... + 46270.

It is an arithmetic number, because the mean of its divisors is an integer number (6681297).

Almost surely, 2^74538820 is an apocalyptic number.

It is an amenable number.

74538820 is an abundant number, since it is smaller than the sum of its proper divisors (85812308).

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

74538820 is a wasteful number, since it uses less digits than its factorization.

74538820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90951 (or 90949 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 74538820 is about 8633.5867401677. The cubic root of 74538820 is about 420.8501675672.

The spelling of 74538820 in words is "seventy-four million, five hundred thirty-eight thousand, eight hundred twenty".