74215681 has 4 divisors (see below), whose sum is σ = 75155200. Its totient is φ = 73276164.

The previous prime is 74215667. The next prime is 74215697. The reversal of 74215681 is 18651247.

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 a cyclic number.

It is not a de Polignac number, because 74215681 - 2⁵ = 74215649 is a prime.

It is a super-2 number, since 2×74215681² = 11015934612587522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74215601) 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, 469641 + ... + 469798.

It is an arithmetic number, because the mean of its divisors is an integer number (18788800).

Almost surely, 2^74215681 is an apocalyptic number.

It is an amenable number.

74215681 is a deficient number, since it is larger than the sum of its proper divisors (939519).

74215681 is an equidigital number, since it uses as much as digits as its factorization.

74215681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939518.

The product of its digits is 13440, while the sum is 34.

The square root of 74215681 is about 8614.8523492861. The cubic root of 74215681 is about 420.2411332633.

The spelling of 74215681 in words is "seventy-four million, two hundred fifteen thousand, six hundred eighty-one".