74991958 has 4 divisors (see below), whose sum is σ = 112487940. Its totient is φ = 37495978.

The previous prime is 74991953. The next prime is 74991977. The reversal of 74991958 is 85919947.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85919947 = 5653 ⋅15199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74991953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18747988 + ... + 18747991.

It is an arithmetic number, because the mean of its divisors is an integer number (28121985).

Almost surely, 2^74991958 is an apocalyptic number.

74991958 is a deficient number, since it is larger than the sum of its proper divisors (37495982).

74991958 is a wasteful number, since it uses less digits than its factorization.

74991958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37495981.

The product of its digits is 816480, while the sum is 52.

The square root of 74991958 is about 8659.7897203108. The cubic root of 74991958 is about 421.7012590332.

The spelling of 74991958 in words is "seventy-four million, nine hundred ninety-one thousand, nine hundred fifty-eight".