72858251 has 4 divisors (see below), whose sum is σ = 72875904. Its totient is φ = 72840600.

The previous prime is 72858241. The next prime is 72858257. The reversal of 72858251 is 15285827.

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: 15285827 = 1061 ⋅14407.

It is a cyclic number.

It is not a de Polignac number, because 72858251 - 2⁶ = 72858187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72858257) 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, 1046 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (18218976).

Almost surely, 2^72858251 is an apocalyptic number.

72858251 is a deficient number, since it is larger than the sum of its proper divisors (17653).

72858251 is a wasteful number, since it uses less digits than its factorization.

72858251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17652.

The product of its digits is 44800, while the sum is 38.

The square root of 72858251 is about 8535.7044817636. The cubic root of 72858251 is about 417.6632342448.

The spelling of 72858251 in words is "seventy-two million, eight hundred fifty-eight thousand, two hundred fifty-one".