78808869 has 20 divisors (see below), whose sum is σ = 118281856. Its totient is φ = 52291656.

The previous prime is 78808861. The next prime is 78808883. The reversal of 78808869 is 96880887.

It is not a de Polignac number, because 78808869 - 2³ = 78808861 is a prime.

It is a super-2 number, since 2×78808869² = 12421675666118322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78808861) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15882 + ... + 20244.

Almost surely, 2^78808869 is an apocalyptic number.

It is an amenable number.

78808869 is a deficient number, since it is larger than the sum of its proper divisors (39472987).

78808869 is a wasteful number, since it uses less digits than its factorization.

78808869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4598 (or 4589 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The square root of 78808869 is about 8877.4359473893. The cubic root of 78808869 is about 428.7377241794.

The spelling of 78808869 in words is "seventy-eight million, eight hundred eight thousand, eight hundred sixty-nine".