78139010 has 16 divisors (see below), whose sum is σ = 143035200. Its totient is φ = 30725616.

The previous prime is 78138959. The next prime is 78139037. The reversal of 78139010 is 1093187.

It is a super-2 number, since 2×78139010² = 12211409767560200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65630 + ... + 66809.

It is an arithmetic number, because the mean of its divisors is an integer number (8939700).

Almost surely, 2^78139010 is an apocalyptic number.

78139010 is a deficient number, since it is larger than the sum of its proper divisors (64896190).

78139010 is a wasteful number, since it uses less digits than its factorization.

78139010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132505.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 78139010 is about 8839.6272545849. The cubic root of 78139010 is about 427.5195390224.

The spelling of 78139010 in words is "seventy-eight million, one hundred thirty-nine thousand, ten".