72755777 has 2 divisors, whose sum is σ = 72755778. Its totient is φ = 72755776.

The previous prime is 72755773. The next prime is 72755833. The reversal of 72755777 is 77755727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42823936 + 29931841 = 6544^2 + 5471^2 .

It is a cyclic number.

It is not a de Polignac number, because 72755777 - 2² = 72755773 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72755773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36377888 + 36377889.

It is an arithmetic number, because the mean of its divisors is an integer number (36377889).

Almost surely, 2^72755777 is an apocalyptic number.

It is an amenable number.

72755777 is a deficient number, since it is larger than the sum of its proper divisors (1).

72755777 is an equidigital number, since it uses as much as digits as its factorization.

72755777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840350, while the sum is 47.

The square root of 72755777 is about 8529.6997016308. The cubic root of 72755777 is about 417.4673300837.

The spelling of 72755777 in words is "seventy-two million, seven hundred fifty-five thousand, seven hundred seventy-seven".