72658779 has 4 divisors (see below), whose sum is σ = 96878376. Its totient is φ = 48439184.

The previous prime is 72658763. The next prime is 72658811. The reversal of 72658779 is 97785627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72658779 - 2⁴ = 72658763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72658739) 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, 12109794 + ... + 12109799.

It is an arithmetic number, because the mean of its divisors is an integer number (24219594).

Almost surely, 2^72658779 is an apocalyptic number.

72658779 is a deficient number, since it is larger than the sum of its proper divisors (24219597).

72658779 is a wasteful number, since it uses less digits than its factorization.

72658779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24219596.

The product of its digits is 1481760, while the sum is 51.

The square root of 72658779 is about 8524.0119075468. The cubic root of 72658779 is about 417.2817250985.

It can be divided in two parts, 72658 and 779, that added together give a palindrome (73437).

The spelling of 72658779 in words is "seventy-two million, six hundred fifty-eight thousand, seven hundred seventy-nine".