78780887 has 2 divisors, whose sum is σ = 78780888. Its totient is φ = 78780886.

The previous prime is 78780869. The next prime is 78780901. The reversal of 78780887 is 78808787.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78780887 - 2¹⁸ = 78518743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78780857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39390443 + 39390444.

It is an arithmetic number, because the mean of its divisors is an integer number (39390444).

Almost surely, 2^78780887 is an apocalyptic number.

78780887 is a deficient number, since it is larger than the sum of its proper divisors (1).

78780887 is an equidigital number, since it uses as much as digits as its factorization.

78780887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1404928, while the sum is 53.

The square root of 78780887 is about 8875.8597893387. The cubic root of 78780887 is about 428.6869754108.

The spelling of 78780887 in words is "seventy-eight million, seven hundred eighty thousand, eight hundred eighty-seven".