72780677 has 2 divisors, whose sum is σ = 72780678. Its totient is φ = 72780676.

The previous prime is 72780661. The next prime is 72780679. The reversal of 72780677 is 77608727.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70795396 + 1985281 = 8414^2 + 1409^2 .

It is a cyclic number.

It is not a de Polignac number, because 72780677 - 2⁴ = 72780661 is a prime.

Together with 72780679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72780679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36390338 + 36390339.

It is an arithmetic number, because the mean of its divisors is an integer number (36390339).

Almost surely, 2^72780677 is an apocalyptic number.

It is an amenable number.

72780677 is a deficient number, since it is larger than the sum of its proper divisors (1).

72780677 is an equidigital number, since it uses as much as digits as its factorization.

72780677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230496, while the sum is 44.

The square root of 72780677 is about 8531.1591826668. The cubic root of 72780677 is about 417.5149494450.

The spelling of 72780677 in words is "seventy-two million, seven hundred eighty thousand, six hundred seventy-seven".