74920621 has 4 divisors (see below), whose sum is σ = 74937952. Its totient is φ = 74903292.

The previous prime is 74920609. The next prime is 74920633. The reversal of 74920621 is 12602947.

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, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (74920609) and next prime (74920633).

It is a cyclic number.

It is not a de Polignac number, because 74920621 - 2⁷ = 74920493 is a prime.

It is a super-2 number, since 2×74920621² = 11226198902051282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74920661) 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, 3730 + ... + 12796.

It is an arithmetic number, because the mean of its divisors is an integer number (18734488).

Almost surely, 2^74920621 is an apocalyptic number.

It is an amenable number.

74920621 is a deficient number, since it is larger than the sum of its proper divisors (17331).

74920621 is an equidigital number, since it uses as much as digits as its factorization.

74920621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17330.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 74920621 is about 8655.6698758675. The cubic root of 74920621 is about 421.5675004833.

The spelling of 74920621 in words is "seventy-four million, nine hundred twenty thousand, six hundred twenty-one".