77320487 has 2 divisors, whose sum is σ = 77320488. Its totient is φ = 77320486.

The previous prime is 77320469. The next prime is 77320501. The reversal of 77320487 is 78402377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77320487 - 2²⁶ = 10211623 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77320487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77320427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38660243 + 38660244.

It is an arithmetic number, because the mean of its divisors is an integer number (38660244).

Almost surely, 2^77320487 is an apocalyptic number.

77320487 is a deficient number, since it is larger than the sum of its proper divisors (1).

77320487 is an equidigital number, since it uses as much as digits as its factorization.

77320487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 77320487 is about 8793.2068666670. The cubic root of 77320487 is about 426.0215095636.

The spelling of 77320487 in words is "seventy-seven million, three hundred twenty thousand, four hundred eighty-seven".