72423501 has 4 divisors (see below), whose sum is σ = 96564672. Its totient is φ = 48282332.

The previous prime is 72423457. The next prime is 72423521. The reversal of 72423501 is 10532427.

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 an emirpimes, since its reverse is a distinct semiprime: 10532427 = 3 ⋅3510809.

It is a cyclic number.

It is not a de Polignac number, because 72423501 - 2⁹ = 72422989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72423521) 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, 12070581 + ... + 12070586.

It is an arithmetic number, because the mean of its divisors is an integer number (24141168).

Almost surely, 2^72423501 is an apocalyptic number.

It is an amenable number.

72423501 is a deficient number, since it is larger than the sum of its proper divisors (24141171).

72423501 is a wasteful number, since it uses less digits than its factorization.

72423501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24141170.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 72423501 is about 8510.1998213908. The cubic root of 72423501 is about 416.8308350063.

Adding to 72423501 its reverse (10532427), we get a palindrome (82955928).

The spelling of 72423501 in words is "seventy-two million, four hundred twenty-three thousand, five hundred one".