77259997 has 2 divisors, whose sum is σ = 77259998. Its totient is φ = 77259996.

The previous prime is 77259989. The next prime is 77260003. The reversal of 77259997 is 79995277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74200996 + 3059001 = 8614^2 + 1749^2 .

It is an emirp because it is prime and its reverse (79995277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77259997 - 2³ = 77259989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77259937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38629998 + 38629999.

It is an arithmetic number, because the mean of its divisors is an integer number (38629999).

Almost surely, 2^77259997 is an apocalyptic number.

It is an amenable number.

77259997 is a deficient number, since it is larger than the sum of its proper divisors (1).

77259997 is an equidigital number, since it uses as much as digits as its factorization.

77259997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2500470, while the sum is 55.

The square root of 77259997 is about 8789.7666066853. The cubic root of 77259997 is about 425.9103843615.

The spelling of 77259997 in words is "seventy-seven million, two hundred fifty-nine thousand, nine hundred ninety-seven".