74871820 has 48 divisors (see below), whose sum is σ = 163392768. Its totient is φ = 28788480.

The previous prime is 74871817. The next prime is 74871821. The reversal of 74871820 is 2817847.

It is a super-2 number, since 2×74871820² = 11211578860224800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 74871820.

It is not an unprimeable number, because it can be changed into a prime (74871821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121834 + ... + 122446.

It is an arithmetic number, because the mean of its divisors is an integer number (3404016).

Almost surely, 2^74871820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74871820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81696384).

74871820 is an abundant number, since it is smaller than the sum of its proper divisors (88520948).

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

74871820 is a wasteful number, since it uses less digits than its factorization.

74871820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850 (or 848 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 74871820 is about 8652.8503974124. The cubic root of 74871820 is about 421.4759485457.

The spelling of 74871820 in words is "seventy-four million, eight hundred seventy-one thousand, eight hundred twenty".