72786887 has 4 divisors (see below), whose sum is σ = 73708320. Its totient is φ = 71865456.

The previous prime is 72786871. The next prime is 72786893. The reversal of 72786887 is 78868727.

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: 78868727 = 7 ⋅11266961.

It is a cyclic number.

It is not a de Polignac number, because 72786887 - 2⁴ = 72786871 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 (72786817) 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, 460598 + ... + 460755.

It is an arithmetic number, because the mean of its divisors is an integer number (18427080).

Almost surely, 2^72786887 is an apocalyptic number.

72786887 is a deficient number, since it is larger than the sum of its proper divisors (921433).

72786887 is an equidigital number, since it uses as much as digits as its factorization.

72786887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921432.

The product of its digits is 2107392, while the sum is 53.

The square root of 72786887 is about 8531.5231348218. The cubic root of 72786887 is about 417.5268239067.

The spelling of 72786887 in words is "seventy-two million, seven hundred eighty-six thousand, eight hundred eighty-seven".