78404234 has 4 divisors (see below), whose sum is σ = 117606354. Its totient is φ = 39202116.

The previous prime is 78404233. The next prime is 78404243. The reversal of 78404234 is 43240487.

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

It can be written as a sum of positive squares in only one way, i.e., 68145025 + 10259209 = 8255^2 + 3203^2 .

It is a super-2 number, since 2×78404234² = 12294447818253512, 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 78404234.

It is not an unprimeable number, because it can be changed into a prime (78404231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19601057 + ... + 19601060.

Almost surely, 2^78404234 is an apocalyptic number.

78404234 is a deficient number, since it is larger than the sum of its proper divisors (39202120).

78404234 is a wasteful number, since it uses less digits than its factorization.

78404234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39202119.

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 78404234 is about 8854.6165360223. The cubic root of 78404234 is about 428.0026967251.

The spelling of 78404234 in words is "seventy-eight million, four hundred four thousand, two hundred thirty-four".