78886878 has 32 divisors (see below), whose sum is σ = 186132480. Its totient is φ = 21811680.

The previous prime is 78886867. The next prime is 78886891. The reversal of 78886878 is 87868887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28993 + ... + 31596.

It is an arithmetic number, because the mean of its divisors is an integer number (5816640).

Almost surely, 2^78886878 is an apocalyptic number.

78886878 is an abundant number, since it is smaller than the sum of its proper divisors (107245602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78886878 is a wasteful number, since it uses less digits than its factorization.

78886878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60632.

The product of its digits is 9633792, while the sum is 60.

The square root of 78886878 is about 8881.8285279553. The cubic root of 78886878 is about 428.8791396161.

Subtracting 78886878 from its reverse (87868887), we obtain a square (8982009 = 2997²).

The spelling of 78886878 in words is "seventy-eight million, eight hundred eighty-six thousand, eight hundred seventy-eight".