74128686 has 32 divisors (see below), whose sum is σ = 154441728. Its totient is φ = 23698080.

The previous prime is 74128679. The next prime is 74128693. The reversal of 74128686 is 68682147.

It is an interprime number because it is at equal distance from previous prime (74128679) and next prime (74128693).

It is a congruent number.

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, 13411 + ... + 18113.

It is an arithmetic number, because the mean of its divisors is an integer number (4826304).

Almost surely, 2^74128686 is an apocalyptic number.

74128686 is an abundant number, since it is smaller than the sum of its proper divisors (80313042).

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

74128686 is a wasteful number, since it uses less digits than its factorization.

With its successor (74128687) it forms an eRAP, since the sums of their prime factors are consecutive (4816 and 4817).

74128686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4816.

The product of its digits is 129024, while the sum is 42.

The square root of 74128686 is about 8609.8017398776. The cubic root of 74128686 is about 420.0768680170.

The spelling of 74128686 in words is "seventy-four million, one hundred twenty-eight thousand, six hundred eighty-six".