72979859 has 4 divisors (see below), whose sum is σ = 75334080. Its totient is φ = 70625640.

The previous prime is 72979849. The next prime is 72979871. The reversal of 72979859 is 95897927.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95897927 = 373 ⋅257099.

It is a cyclic number.

It is not a de Polignac number, because 72979859 - 2⁴ = 72979843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72979849) 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, 1177064 + ... + 1177125.

It is an arithmetic number, because the mean of its divisors is an integer number (18833520).

Almost surely, 2^72979859 is an apocalyptic number.

72979859 is a deficient number, since it is larger than the sum of its proper divisors (2354221).

72979859 is a wasteful number, since it uses less digits than its factorization.

72979859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354220.

The product of its digits is 2857680, while the sum is 56.

The square root of 72979859 is about 8542.8250011340. The cubic root of 72979859 is about 417.8954795407.

The spelling of 72979859 in words is "seventy-two million, nine hundred seventy-nine thousand, eight hundred fifty-nine".