74877991 has 4 divisors (see below), whose sum is σ = 75030984. Its totient is φ = 74725000.

The previous prime is 74877967. The next prime is 74877997. The reversal of 74877991 is 19977847.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19977847 = 109 ⋅183283.

It is a cyclic number.

It is not a de Polignac number, because 74877991 - 2⁷ = 74877863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74877997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75760 + ... + 76741.

It is an arithmetic number, because the mean of its divisors is an integer number (18757746).

Almost surely, 2^74877991 is an apocalyptic number.

74877991 is a deficient number, since it is larger than the sum of its proper divisors (152993).

74877991 is a wasteful number, since it uses less digits than its factorization.

74877991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152992.

The product of its digits is 889056, while the sum is 52.

The square root of 74877991 is about 8653.2069777626. The cubic root of 74877991 is about 421.4875276980.

The spelling of 74877991 in words is "seventy-four million, eight hundred seventy-seven thousand, nine hundred ninety-one".