74577981 has 4 divisors (see below), whose sum is σ = 99437312. Its totient is φ = 49718652.

The previous prime is 74577967. The next prime is 74577989. The reversal of 74577981 is 18977547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 74577981 - 2⁵ = 74577949 is a prime.

It is a super-2 number, since 2×74577981² = 11123750500072722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74577981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74577989) 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, 12429661 + ... + 12429666.

It is an arithmetic number, because the mean of its divisors is an integer number (24859328).

Almost surely, 2^74577981 is an apocalyptic number.

It is an amenable number.

74577981 is a deficient number, since it is larger than the sum of its proper divisors (24859331).

74577981 is a wasteful number, since it uses less digits than its factorization.

74577981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24859330.

The product of its digits is 493920, while the sum is 48.

The square root of 74577981 is about 8635.8543873782. The cubic root of 74577981 is about 420.9238563646.

The spelling of 74577981 in words is "seventy-four million, five hundred seventy-seven thousand, nine hundred eighty-one".