78239494 has 4 divisors (see below), whose sum is σ = 117359244. Its totient is φ = 39119746.

The previous prime is 78239479. The next prime is 78239503. The reversal of 78239494 is 49493287.

It is a happy number.

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

It is a super-2 number, since 2×78239494² = 12242836842752072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19559872 + ... + 19559875.

It is an arithmetic number, because the mean of its divisors is an integer number (29339811).

Almost surely, 2^78239494 is an apocalyptic number.

78239494 is a deficient number, since it is larger than the sum of its proper divisors (39119750).

78239494 is a wasteful number, since it uses less digits than its factorization.

78239494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39119749.

The product of its digits is 435456, while the sum is 46.

The square root of 78239494 is about 8845.3091523134. The cubic root of 78239494 is about 427.7027188535.

The spelling of 78239494 in words is "seventy-eight million, two hundred thirty-nine thousand, four hundred ninety-four".