78135942 has 32 divisors (see below), whose sum is σ = 167299200. Its totient is φ = 24254208.

The previous prime is 78135929. The next prime is 78135943. The reversal of 78135942 is 24953187.

It is a super-2 number, since 2×78135942² = 12210450864454728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78135942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78135943) 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, 918 + ... + 12534.

It is an arithmetic number, because the mean of its divisors is an integer number (5228100).

Almost surely, 2^78135942 is an apocalyptic number.

78135942 is an abundant number, since it is smaller than the sum of its proper divisors (89163258).

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

78135942 is a wasteful number, since it uses less digits than its factorization.

78135942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11700.

The product of its digits is 60480, while the sum is 39.

The square root of 78135942 is about 8839.4537161524. The cubic root of 78135942 is about 427.5139436648.

The spelling of 78135942 in words is "seventy-eight million, one hundred thirty-five thousand, nine hundred forty-two".