72424631 has 4 divisors (see below), whose sum is σ = 75573552. Its totient is φ = 69275712.

The previous prime is 72424621. The next prime is 72424633. The reversal of 72424631 is 13642427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13642427 = 23 ⋅593149.

It is a cyclic number.

It is not a de Polignac number, because 72424631 - 2²⁶ = 5315767 is a prime.

It is a super-2 number, since 2×72424631² = 10490654350972322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72424594 and 72424603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72424633) 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, 1574426 + ... + 1574471.

It is an arithmetic number, because the mean of its divisors is an integer number (18893388).

Almost surely, 2^72424631 is an apocalyptic number.

72424631 is a deficient number, since it is larger than the sum of its proper divisors (3148921).

72424631 is a wasteful number, since it uses less digits than its factorization.

72424631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3148920.

The product of its digits is 8064, while the sum is 29.

The square root of 72424631 is about 8510.2662120524. The cubic root of 72424631 is about 416.8330028864.

The spelling of 72424631 in words is "seventy-two million, four hundred twenty-four thousand, six hundred thirty-one".