78810871 has 2 divisors, whose sum is σ = 78810872. Its totient is φ = 78810870.

The previous prime is 78810863. The next prime is 78810877. The reversal of 78810871 is 17801887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78810871 - 2³ = 78810863 is a prime.

It is a super-2 number, since 2×78810871² = 12422306775557282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78810877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39405435 + 39405436.

It is an arithmetic number, because the mean of its divisors is an integer number (39405436).

Almost surely, 2^78810871 is an apocalyptic number.

78810871 is a deficient number, since it is larger than the sum of its proper divisors (1).

78810871 is an equidigital number, since it uses as much as digits as its factorization.

78810871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25088, while the sum is 40.

The square root of 78810871 is about 8877.5487044567. The cubic root of 78810871 is about 428.7413545900.

The spelling of 78810871 in words is "seventy-eight million, eight hundred ten thousand, eight hundred seventy-one".