72423515 has 4 divisors (see below), whose sum is σ = 86908224. Its totient is φ = 57938808.

The previous prime is 72423457. The next prime is 72423521. The reversal of 72423515 is 51532427.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51532427 = 19 ⋅2712233.

It is a cyclic number.

It is not a de Polignac number, because 72423515 - 2⁸ = 72423259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7242347 + ... + 7242356.

It is an arithmetic number, because the mean of its divisors is an integer number (21727056).

Almost surely, 2^72423515 is an apocalyptic number.

72423515 is a deficient number, since it is larger than the sum of its proper divisors (14484709).

72423515 is a wasteful number, since it uses less digits than its factorization.

72423515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14484708.

The product of its digits is 8400, while the sum is 29.

The square root of 72423515 is about 8510.2006439331. The cubic root of 72423515 is about 416.8308618651.

The spelling of 72423515 in words is "seventy-two million, four hundred twenty-three thousand, five hundred fifteen".