78412138 has 8 divisors (see below), whose sum is σ = 134420832. Its totient is φ = 33605196.

The previous prime is 78412127. The next prime is 78412141. The reversal of 78412138 is 83121487.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78412138² = 12296926771462088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2800420 + ... + 2800447.

It is an arithmetic number, because the mean of its divisors is an integer number (16802604).

Almost surely, 2^78412138 is an apocalyptic number.

78412138 is a deficient number, since it is larger than the sum of its proper divisors (56008694).

78412138 is a wasteful number, since it uses less digits than its factorization.

78412138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600876.

The product of its digits is 10752, while the sum is 34.

The square root of 78412138 is about 8855.0628456268. The cubic root of 78412138 is about 428.0170786850.

The spelling of 78412138 in words is "seventy-eight million, four hundred twelve thousand, one hundred thirty-eight".