72551893 has 4 divisors (see below), whose sum is σ = 72569260. Its totient is φ = 72534528.

The previous prime is 72551891. The next prime is 72551911. The reversal of 72551893 is 39815527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39815527 = 397 ⋅100291.

It can be written as a sum of positive squares in 2 ways, for example, as 11992369 + 60559524 = 3463^2 + 7782^2 .

It is a cyclic number.

It is not a de Polignac number, because 72551893 - 2¹ = 72551891 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551891) 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, 1813 + ... + 12181.

It is an arithmetic number, because the mean of its divisors is an integer number (18142315).

Almost surely, 2^72551893 is an apocalyptic number.

It is an amenable number.

72551893 is a deficient number, since it is larger than the sum of its proper divisors (17367).

72551893 is a wasteful number, since it uses less digits than its factorization.

72551893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17366.

The product of its digits is 75600, while the sum is 40.

The square root of 72551893 is about 8517.7398997621. The cubic root of 72551893 is about 417.0770080929.

The spelling of 72551893 in words is "seventy-two million, five hundred fifty-one thousand, eight hundred ninety-three".