78504394 has 4 divisors (see below), whose sum is σ = 117756594. Its totient is φ = 39252196.

The previous prime is 78504373. The next prime is 78504401. The reversal of 78504394 is 49340587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49340587 = 19 ⋅2596873.

It can be written as a sum of positive squares in only one way, i.e., 49182169 + 29322225 = 7013^2 + 5415^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19626097 + ... + 19626100.

Almost surely, 2^78504394 is an apocalyptic number.

78504394 is a deficient number, since it is larger than the sum of its proper divisors (39252200).

78504394 is a wasteful number, since it uses less digits than its factorization.

78504394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39252199.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 78504394 is about 8860.2705376303. The cubic root of 78504394 is about 428.1848744221.

The spelling of 78504394 in words is "seventy-eight million, five hundred four thousand, three hundred ninety-four".