72591851 has 4 divisors (see below), whose sum is σ = 72893304. Its totient is φ = 72290400.

The previous prime is 72591833. The next prime is 72591907. The reversal of 72591851 is 15819527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15819527 = 137 ⋅115471.

It is a cyclic number.

It is not a de Polignac number, because 72591851 - 2⁶ = 72591787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72591811) 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, 150365 + ... + 150846.

It is an arithmetic number, because the mean of its divisors is an integer number (18223326).

Almost surely, 2^72591851 is an apocalyptic number.

72591851 is a deficient number, since it is larger than the sum of its proper divisors (301453).

72591851 is a wasteful number, since it uses less digits than its factorization.

72591851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301452.

The product of its digits is 25200, while the sum is 38.

The square root of 72591851 is about 8520.0851521566. The cubic root of 72591851 is about 417.1535625140.

The spelling of 72591851 in words is "seventy-two million, five hundred ninety-one thousand, eight hundred fifty-one".