78117412 has 24 divisors (see below), whose sum is σ = 141680000. Its totient is φ = 37660896.

The previous prime is 78117401. The next prime is 78117419. The reversal of 78117412 is 21471187.

It is a super-2 number, since 2×78117412² = 12204660115155488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78117419) 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, 10714 + ... + 16462.

Almost surely, 2^78117412 is an apocalyptic number.

It is an amenable number.

78117412 is a deficient number, since it is larger than the sum of its proper divisors (63562588).

78117412 is a wasteful number, since it uses less digits than its factorization.

78117412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5875 (or 5873 counting only the distinct ones).

The product of its digits is 3136, while the sum is 31.

The square root of 78117412 is about 8838.4055123082. The cubic root of 78117412 is about 427.4801459037.

Adding to 78117412 its reverse (21471187), we get a palindrome (99588599).

The spelling of 78117412 in words is "seventy-eight million, one hundred seventeen thousand, four hundred twelve".