74561820 has 48 divisors (see below), whose sum is σ = 215513088. Its totient is φ = 19241280.

The previous prime is 74561819. The next prime is 74561869. The reversal of 74561820 is 2816547.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 18184 + ... + 21903.

It is an arithmetic number, because the mean of its divisors is an integer number (4489856).

Almost surely, 2^74561820 is an apocalyptic number.

It is an amenable number.

74561820 is an abundant number, since it is smaller than the sum of its proper divisors (140951268).

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

74561820 is a wasteful number, since it uses less digits than its factorization.

74561820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40130 (or 40128 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 74561820 is about 8634.9186446660. The cubic root of 74561820 is about 420.8934495261.

The spelling of 74561820 in words is "seventy-four million, five hundred sixty-one thousand, eight hundred twenty".