77388959 has 2 divisors, whose sum is σ = 77388960. Its totient is φ = 77388958.

The previous prime is 77388821. The next prime is 77388973. The reversal of 77388959 is 95988377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77388959 - 2¹⁶ = 77323423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77388659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38694479 + 38694480.

It is an arithmetic number, because the mean of its divisors is an integer number (38694480).

Almost surely, 2^77388959 is an apocalyptic number.

77388959 is a deficient number, since it is larger than the sum of its proper divisors (1).

77388959 is an equidigital number, since it uses as much as digits as its factorization.

77388959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 56.

The square root of 77388959 is about 8797.0994651646. The cubic root of 77388959 is about 426.1472284574.

The spelling of 77388959 in words is "seventy-seven million, three hundred eighty-eight thousand, nine hundred fifty-nine".