72424681 has 4 divisors (see below), whose sum is σ = 82771072. Its totient is φ = 62078292.

The previous prime is 72424679. The next prime is 72424691. The reversal of 72424681 is 18642427.

It is a happy number.

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 72424681 - 2¹ = 72424679 is a prime.

It is a super-2 number, since 2×72424681² = 10490668835903522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72424621) 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, 5173185 + ... + 5173198.

It is an arithmetic number, because the mean of its divisors is an integer number (20692768).

Almost surely, 2^72424681 is an apocalyptic number.

It is an amenable number.

72424681 is a deficient number, since it is larger than the sum of its proper divisors (10346391).

72424681 is a wasteful number, since it uses less digits than its factorization.

72424681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10346390.

The product of its digits is 21504, while the sum is 34.

The square root of 72424681 is about 8510.2691496803. The cubic root of 72424681 is about 416.8330988097.

The spelling of 72424681 in words is "seventy-two million, four hundred twenty-four thousand, six hundred eighty-one".