77239087 has 2 divisors, whose sum is σ = 77239088. Its totient is φ = 77239086.

The previous prime is 77239081. The next prime is 77239117. The reversal of 77239087 is 78093277.

It is a weak prime.

It is an emirp because it is prime and its reverse (78093277) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77239087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77239081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38619543 + 38619544.

It is an arithmetic number, because the mean of its divisors is an integer number (38619544).

Almost surely, 2^77239087 is an apocalyptic number.

77239087 is a deficient number, since it is larger than the sum of its proper divisors (1).

77239087 is an equidigital number, since it uses as much as digits as its factorization.

77239087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 77239087 is about 8788.5770748171. The cubic root of 77239087 is about 425.8719574479.

The spelling of 77239087 in words is "seventy-seven million, two hundred thirty-nine thousand, eighty-seven".