78135684 has 24 divisors (see below), whose sum is σ = 198891168. Its totient is φ = 23677440.

The previous prime is 78135683. The next prime is 78135691. The reversal of 78135684 is 48653187.

It is a super-2 number, since 2×78135684² = 12210370228295712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78135683) 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, 295837 + ... + 296100.

It is an arithmetic number, because the mean of its divisors is an integer number (8287132).

Almost surely, 2^78135684 is an apocalyptic number.

It is an amenable number.

78135684 is an abundant number, since it is smaller than the sum of its proper divisors (120755484).

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

78135684 is a wasteful number, since it uses less digits than its factorization.

78135684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591955 (or 591953 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 78135684 is about 8839.4391224783. The cubic root of 78135684 is about 427.5134731228.

The spelling of 78135684 in words is "seventy-eight million, one hundred thirty-five thousand, six hundred eighty-four".