78404134 has 4 divisors (see below), whose sum is σ = 117606204. Its totient is φ = 39202066.

The previous prime is 78404129. The next prime is 78404149. The reversal of 78404134 is 43140487.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78404134² = 12294416456579912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 78404096 and 78404105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19601032 + ... + 19601035.

It is an arithmetic number, because the mean of its divisors is an integer number (29401551).

Almost surely, 2^78404134 is an apocalyptic number.

78404134 is a deficient number, since it is larger than the sum of its proper divisors (39202070).

78404134 is a wasteful number, since it uses less digits than its factorization.

78404134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39202069.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 78404134 is about 8854.6108892486. The cubic root of 78404134 is about 428.0025147609.

The spelling of 78404134 in words is "seventy-eight million, four hundred four thousand, one hundred thirty-four".