78139996 has 12 divisors (see below), whose sum is σ = 149176440. Its totient is φ = 35518160.

The previous prime is 78139931. The next prime is 78140009. The reversal of 78139996 is 69993187.

It is a super-2 number, since 2×78139996² = 12211717949760032, 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887911 + ... + 887998.

It is an arithmetic number, because the mean of its divisors is an integer number (12431370).

Almost surely, 2^78139996 is an apocalyptic number.

It is an amenable number.

78139996 is a deficient number, since it is larger than the sum of its proper divisors (71036444).

78139996 is a wasteful number, since it uses less digits than its factorization.

78139996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775924 (or 1775922 counting only the distinct ones).

The product of its digits is 734832, while the sum is 52.

The square root of 78139996 is about 8839.6830259914. The cubic root of 78139996 is about 427.5213372385.

The spelling of 78139996 in words is "seventy-eight million, one hundred thirty-nine thousand, nine hundred ninety-six".