72658281 has 4 divisors (see below), whose sum is σ = 96877712. Its totient is φ = 48438852.

The previous prime is 72658279. The next prime is 72658297. The reversal of 72658281 is 18285627.

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: 18285627 = 3 ⋅6095209.

It is not a de Polignac number, because 72658281 - 2¹ = 72658279 is a prime.

It is a super-2 number, since 2×72658281² = 10558451595749922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72658231) 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, 12109711 + ... + 12109716.

It is an arithmetic number, because the mean of its divisors is an integer number (24219428).

Almost surely, 2^72658281 is an apocalyptic number.

It is an amenable number.

72658281 is a deficient number, since it is larger than the sum of its proper divisors (24219431).

72658281 is a wasteful number, since it uses less digits than its factorization.

72658281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24219430.

The product of its digits is 53760, while the sum is 39.

The square root of 72658281 is about 8523.9826958998. The cubic root of 72658281 is about 417.2807717530.

The spelling of 72658281 in words is "seventy-two million, six hundred fifty-eight thousand, two hundred eighty-one".