72279979 has 2 divisors, whose sum is σ = 72279980. Its totient is φ = 72279978.

The previous prime is 72279973. The next prime is 72280037. The reversal of 72279979 is 97997227.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72279979 is a prime.

It is not a weakly prime, because it can be changed into another prime (72279973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36139989 + 36139990.

It is an arithmetic number, because the mean of its divisors is an integer number (36139990).

Almost surely, 2^72279979 is an apocalyptic number.

72279979 is a deficient number, since it is larger than the sum of its proper divisors (1).

72279979 is an equidigital number, since it uses as much as digits as its factorization.

72279979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000188, while the sum is 52.

The square root of 72279979 is about 8501.7632876951. The cubic root of 72279979 is about 416.5553076985. Note that the first 3 decimals are identical.

The spelling of 72279979 in words is "seventy-two million, two hundred seventy-nine thousand, nine hundred seventy-nine".