77728723 has 2 divisors, whose sum is σ = 77728724. Its totient is φ = 77728722.

The previous prime is 77728711. The next prime is 77728733. The reversal of 77728723 is 32782777.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77728723 - 2¹⁷ = 77597651 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77728723.

It is not a weakly prime, because it can be changed into another prime (77728733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38864361 + 38864362.

It is an arithmetic number, because the mean of its divisors is an integer number (38864362).

Almost surely, 2^77728723 is an apocalyptic number.

77728723 is a deficient number, since it is larger than the sum of its proper divisors (1).

77728723 is an equidigital number, since it uses as much as digits as its factorization.

77728723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230496, while the sum is 43.

The square root of 77728723 is about 8816.3894537390. The cubic root of 77728723 is about 426.7699620373.

The spelling of 77728723 in words is "seventy-seven million, seven hundred twenty-eight thousand, seven hundred twenty-three".