78631087 has 2 divisors, whose sum is σ = 78631088. Its totient is φ = 78631086.

The previous prime is 78631079. The next prime is 78631099. The reversal of 78631087 is 78013687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78631087 - 2³ = 78631079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78631027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39315543 + 39315544.

It is an arithmetic number, because the mean of its divisors is an integer number (39315544).

Almost surely, 2^78631087 is an apocalyptic number.

78631087 is a deficient number, since it is larger than the sum of its proper divisors (1).

78631087 is an equidigital number, since it uses as much as digits as its factorization.

78631087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 78631087 is about 8867.4171549556. The cubic root of 78631087 is about 428.4150902833.

The spelling of 78631087 in words is "seventy-eight million, six hundred thirty-one thousand, eighty-seven".