72979809 has 8 divisors (see below), whose sum is σ = 111207360. Its totient is φ = 41702736.

The previous prime is 72979783. The next prime is 72979813. The reversal of 72979809 is 90897927.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72979809 - 2⁷ = 72979681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72979849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1737594 + ... + 1737635.

It is an arithmetic number, because the mean of its divisors is an integer number (13900920).

Almost surely, 2^72979809 is an apocalyptic number.

It is an amenable number.

72979809 is a deficient number, since it is larger than the sum of its proper divisors (38227551).

72979809 is a wasteful number, since it uses less digits than its factorization.

72979809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3475239.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 72979809 is about 8542.8220747011. The cubic root of 72979809 is about 417.8953841044.

The spelling of 72979809 in words is "seventy-two million, nine hundred seventy-nine thousand, eight hundred nine".