74542820 has 48 divisors (see below), whose sum is σ = 172972800. Its totient is φ = 26757120.

The previous prime is 74542801. The next prime is 74542843. The reversal of 74542820 is 2824547.

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, 15236 + ... + 19524.

It is an arithmetic number, because the mean of its divisors is an integer number (3603600).

Almost surely, 2^74542820 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 74542820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86486400).

74542820 is an abundant number, since it is smaller than the sum of its proper divisors (98429980).

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

74542820 is a wasteful number, since it uses less digits than its factorization.

74542820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4388 (or 4386 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 74542820 is about 8633.8183904921. The cubic root of 74542820 is about 420.8576955039.

The spelling of 74542820 in words is "seventy-four million, five hundred forty-two thousand, eight hundred twenty".