77722993 has 2 divisors, whose sum is σ = 77722994. Its totient is φ = 77722992.

The previous prime is 77722951. The next prime is 77722999. The reversal of 77722993 is 39922777.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77580864 + 142129 = 8808^2 + 377^2 .

It is an emirp because it is prime and its reverse (39922777) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77722993 - 2²¹ = 75625841 is a prime.

It is not a weakly prime, because it can be changed into another prime (77722999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38861496 + 38861497.

It is an arithmetic number, because the mean of its divisors is an integer number (38861497).

Almost surely, 2^77722993 is an apocalyptic number.

It is an amenable number.

77722993 is a deficient number, since it is larger than the sum of its proper divisors (1).

77722993 is an equidigital number, since it uses as much as digits as its factorization.

77722993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 333396, while the sum is 46.

The square root of 77722993 is about 8816.0644847914. The cubic root of 77722993 is about 426.7594749146.

The spelling of 77722993 in words is "seventy-seven million, seven hundred twenty-two thousand, nine hundred ninety-three".