74428691 has 4 divisors (see below), whose sum is σ = 74448384. Its totient is φ = 74409000.

The previous prime is 74428687. The next prime is 74428729. The reversal of 74428691 is 19682447.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19682447 = 17 ⋅1157791.

It is a cyclic number.

It is not a de Polignac number, because 74428691 - 2² = 74428687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74448691) 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, 2195 + ... + 12396.

It is an arithmetic number, because the mean of its divisors is an integer number (18612096).

Almost surely, 2^74428691 is an apocalyptic number.

74428691 is a deficient number, since it is larger than the sum of its proper divisors (19693).

74428691 is a wasteful number, since it uses less digits than its factorization.

74428691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19692.

The product of its digits is 96768, while the sum is 41.

The square root of 74428691 is about 8627.2064424123. The cubic root of 74428691 is about 420.6428006644.

The spelling of 74428691 in words is "seventy-four million, four hundred twenty-eight thousand, six hundred ninety-one".