78889761 has 16 divisors (see below), whose sum is σ = 120645120. Its totient is φ = 50896080.

The previous prime is 78889703. The next prime is 78889763. The reversal of 78889761 is 16798887.

It is not a de Polignac number, because 78889761 - 2⁷ = 78889633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78889698 and 78889707.

It is not an unprimeable number, because it can be changed into a prime (78889763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46290 + ... + 47963.

It is an arithmetic number, because the mean of its divisors is an integer number (7540320).

Almost surely, 2^78889761 is an apocalyptic number.

It is an amenable number.

78889761 is a deficient number, since it is larger than the sum of its proper divisors (41755359).

78889761 is a wasteful number, since it uses less digits than its factorization.

78889761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94293 (or 94287 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 78889761 is about 8881.9908241340. The cubic root of 78889761 is about 428.8843641584.

The spelling of 78889761 in words is "seventy-eight million, eight hundred eighty-nine thousand, seven hundred sixty-one".