72428615 has 24 divisors (see below), whose sum is σ = 102140352. Its totient is φ = 49156800.

The previous prime is 72428611. The next prime is 72428623. The reversal of 72428615 is 51682427.

It is not a de Polignac number, because 72428615 - 2² = 72428611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72428611) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 23282 + ... + 26208.

It is an arithmetic number, because the mean of its divisors is an integer number (4255848).

Almost surely, 2^72428615 is an apocalyptic number.

72428615 is a deficient number, since it is larger than the sum of its proper divisors (29711737).

72428615 is a wasteful number, since it uses less digits than its factorization.

72428615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3047 (or 3040 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 72428615 is about 8510.5002790670. The cubic root of 72428615 is about 416.8406459226.

It can be divided in two parts, 7242861 and 5, that multiplied together give a triangular number (36214305 = T₈₅₁₀).

The spelling of 72428615 in words is "seventy-two million, four hundred twenty-eight thousand, six hundred fifteen".