74887731 has 6 divisors (see below), whose sum is σ = 108171180. Its totient is φ = 49925148.

The previous prime is 74887691. The next prime is 74887733. The reversal of 74887731 is 13778847.

It is a happy number.

It is not a de Polignac number, because 74887731 - 2¹¹ = 74885683 is a prime.

It is a super-2 number, since 2×74887731² = 11216344508656722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74887733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4160421 + ... + 4160438.

It is an arithmetic number, because the mean of its divisors is an integer number (18028530).

Almost surely, 2^74887731 is an apocalyptic number.

74887731 is a deficient number, since it is larger than the sum of its proper divisors (33283449).

74887731 is a wasteful number, since it uses less digits than its factorization.

74887731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320865 (or 8320862 counting only the distinct ones).

The product of its digits is 263424, while the sum is 45.

The square root of 74887731 is about 8653.7697565859. The cubic root of 74887731 is about 421.5058023627.

The spelling of 74887731 in words is "seventy-four million, eight hundred eighty-seven thousand, seven hundred thirty-one".