78994078 has 4 divisors (see below), whose sum is σ = 118491120. Its totient is φ = 39497038.

The previous prime is 78994051. The next prime is 78994081. The reversal of 78994078 is 87049987.

It is a happy number.

78994078 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87049987 = 163 ⋅534049.

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, 19748518 + ... + 19748521.

It is an arithmetic number, because the mean of its divisors is an integer number (29622780).

Almost surely, 2^78994078 is an apocalyptic number.

78994078 is a deficient number, since it is larger than the sum of its proper divisors (39497042).

78994078 is a wasteful number, since it uses less digits than its factorization.

78994078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39497041.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 78994078 is about 8887.8612725447. The cubic root of 78994078 is about 429.0733207651.

The spelling of 78994078 in words is "seventy-eight million, nine hundred ninety-four thousand, seventy-eight".