74909891 has 8 divisors (see below), whose sum is σ = 87015264. Its totient is φ = 63155520.

The previous prime is 74909843. The next prime is 74909893. The reversal of 74909891 is 19890947.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74909891 is a prime.

It is a super-2 number, since 2×74909891² = 11222983539263762, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74909893) 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, 87290 + ... + 88143.

It is an arithmetic number, because the mean of its divisors is an integer number (10876908).

Almost surely, 2^74909891 is an apocalyptic number.

74909891 is a deficient number, since it is larger than the sum of its proper divisors (12105373).

74909891 is a wasteful number, since it uses less digits than its factorization.

74909891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175501.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 74909891 is about 8655.0500287404. The cubic root of 74909891 is about 421.5473741363.

The spelling of 74909891 in words is "seventy-four million, nine hundred nine thousand, eight hundred ninety-one".