78779671 has 2 divisors, whose sum is σ = 78779672. Its totient is φ = 78779670.

The previous prime is 78779663. The next prime is 78779777. The reversal of 78779671 is 17697787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78779671 - 2³ = 78779663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78779621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39389835 + 39389836.

It is an arithmetic number, because the mean of its divisors is an integer number (39389836).

Almost surely, 2^78779671 is an apocalyptic number.

78779671 is a deficient number, since it is larger than the sum of its proper divisors (1).

78779671 is an equidigital number, since it uses as much as digits as its factorization.

78779671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1037232, while the sum is 52.

The square root of 78779671 is about 8875.7912886683. The cubic root of 78779671 is about 428.6847697741.

The spelling of 78779671 in words is "seventy-eight million, seven hundred seventy-nine thousand, six hundred seventy-one".