78751879 has 2 divisors, whose sum is σ = 78751880. Its totient is φ = 78751878.

The previous prime is 78751853. The next prime is 78751891. The reversal of 78751879 is 97815787.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78751879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78751819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39375939 + 39375940.

It is an arithmetic number, because the mean of its divisors is an integer number (39375940).

Almost surely, 2^78751879 is an apocalyptic number.

78751879 is a deficient number, since it is larger than the sum of its proper divisors (1).

78751879 is an equidigital number, since it uses as much as digits as its factorization.

78751879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 52.

The square root of 78751879 is about 8874.2255436742. The cubic root of 78751879 is about 428.6343531787.

The spelling of 78751879 in words is "seventy-eight million, seven hundred fifty-one thousand, eight hundred seventy-nine".