74129691 has 4 divisors (see below), whose sum is σ = 98839592. Its totient is φ = 49419792.

The previous prime is 74129687. The next prime is 74129717. The reversal of 74129691 is 19692147.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 74129691 - 2² = 74129687 is a prime.

It is a super-2 number, since 2×74129691² = 10990422175510962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74129641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12354946 + ... + 12354951.

It is an arithmetic number, because the mean of its divisors is an integer number (24709898).

Almost surely, 2^74129691 is an apocalyptic number.

74129691 is a deficient number, since it is larger than the sum of its proper divisors (24709901).

74129691 is a wasteful number, since it uses less digits than its factorization.

74129691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24709900.

The product of its digits is 27216, while the sum is 39.

The square root of 74129691 is about 8609.8601033931. The cubic root of 74129691 is about 420.0787664064.

The spelling of 74129691 in words is "seventy-four million, one hundred twenty-nine thousand, six hundred ninety-one".