72855779 has 2 divisors, whose sum is σ = 72855780. Its totient is φ = 72855778.

The previous prime is 72855767. The next prime is 72855787. The reversal of 72855779 is 97755827.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72855779 is a prime.

It is not a weakly prime, because it can be changed into another prime (72855749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36427889 + 36427890.

It is an arithmetic number, because the mean of its divisors is an integer number (36427890).

Almost surely, 2^72855779 is an apocalyptic number.

72855779 is a deficient number, since it is larger than the sum of its proper divisors (1).

72855779 is an equidigital number, since it uses as much as digits as its factorization.

72855779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234800, while the sum is 50.

The square root of 72855779 is about 8535.5596770218. The cubic root of 72855779 is about 417.6585105740.

The spelling of 72855779 in words is "seventy-two million, eight hundred fifty-five thousand, seven hundred seventy-nine".