77772493 has 2 divisors, whose sum is σ = 77772494. Its totient is φ = 77772492.

The previous prime is 77772469. The next prime is 77772503. The reversal of 77772493 is 39427777.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74338884 + 3433609 = 8622^2 + 1853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77772493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77772413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38886246 + 38886247.

It is an arithmetic number, because the mean of its divisors is an integer number (38886247).

Almost surely, 2^77772493 is an apocalyptic number.

It is an amenable number.

77772493 is a deficient number, since it is larger than the sum of its proper divisors (1).

77772493 is an equidigital number, since it uses as much as digits as its factorization.

77772493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 46.

The square root of 77772493 is about 8818.8714130551. The cubic root of 77772493 is about 426.8500534774.

The spelling of 77772493 in words is "seventy-seven million, seven hundred seventy-two thousand, four hundred ninety-three".