78886140 has 24 divisors (see below), whose sum is σ = 220881360. Its totient is φ = 21036288.

The previous prime is 78886121. The next prime is 78886141. The reversal of 78886140 is 4168887.

It is a junction number, because it is equal to n+sod(n) for n = 78886092 and 78886101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78886141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 657325 + ... + 657444.

It is an arithmetic number, because the mean of its divisors is an integer number (9203390).

Almost surely, 2^78886140 is an apocalyptic number.

It is an amenable number.

78886140 is an abundant number, since it is smaller than the sum of its proper divisors (141995220).

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

78886140 is a wasteful number, since it uses less digits than its factorization.

78886140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314781 (or 1314779 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 78886140 is about 8881.7869823589. The cubic root of 78886140 is about 428.8778021998.

It can be divided in two parts, 7888 and 6140, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 78886140 in words is "seventy-eight million, eight hundred eighty-six thousand, one hundred forty".