74747780 has 24 divisors (see below), whose sum is σ = 157149720. Its totient is φ = 29864960.

The previous prime is 74747779. The next prime is 74747791. The reversal of 74747780 is 8774747.

It can be written as a sum of positive squares in 4 ways, for example, as 51380224 + 23367556 = 7168^2 + 4834^2 .

It is a super-2 number, since 2×74747780² = 11174461229856800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23060 + ... + 26100.

It is an arithmetic number, because the mean of its divisors is an integer number (6547905).

Almost surely, 2^74747780 is an apocalyptic number.

It is an amenable number.

74747780 is an abundant number, since it is smaller than the sum of its proper divisors (82401940).

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

74747780 is a wasteful number, since it uses less digits than its factorization.

74747780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279 (or 4277 counting only the distinct ones).

The product of its (nonzero) digits is 307328, while the sum is 44.

The square root of 74747780 is about 8645.6798460271. The cubic root of 74747780 is about 421.2430670961.

The spelling of 74747780 in words is "seventy-four million, seven hundred forty-seven thousand, seven hundred eighty".