74986991 has 8 divisors (see below), whose sum is σ = 77538384. Its totient is φ = 72470080.

The previous prime is 74986979. The next prime is 74987021. The reversal of 74986991 is 19968947.

74986991 = T₁₁₃₀ + T₁₁₃₁ + ... + T₁₂₃₆.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74986991 - 2⁶ = 74986927 is a prime.

It is a Duffinian number.

74986991 is a modest number, since divided by 86991 gives 749 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74986921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4160 + ... + 12933.

It is an arithmetic number, because the mean of its divisors is an integer number (9692298).

Almost surely, 2^74986991 is an apocalyptic number.

74986991 is a deficient number, since it is larger than the sum of its proper divisors (2551393).

74986991 is a wasteful number, since it uses less digits than its factorization.

74986991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17241.

The product of its digits is 979776, while the sum is 53.

The square root of 74986991 is about 8659.5029303073. The cubic root of 74986991 is about 421.6919485398.

The spelling of 74986991 in words is "seventy-four million, nine hundred eighty-six thousand, nine hundred ninety-one".