74215820 has 48 divisors (see below), whose sum is σ = 181923840. Its totient is φ = 24901824.

The previous prime is 74215783. The next prime is 74215831. The reversal of 74215820 is 2851247.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 941 + ... + 12219.

It is an arithmetic number, because the mean of its divisors is an integer number (3790080).

Almost surely, 2^74215820 is an apocalyptic number.

74215820 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74215820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90961920).

74215820 is an abundant number, since it is smaller than the sum of its proper divisors (107708020).

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

74215820 is a wasteful number, since it uses less digits than its factorization.

74215820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11342 (or 11340 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 74215820 is about 8614.8604167450. The cubic root of 74215820 is about 420.2413956225.

The spelling of 74215820 in words is "seventy-four million, two hundred fifteen thousand, eight hundred twenty".