80139278 has 16 divisors (see below), whose sum is σ = 124416000. Its totient is φ = 38674200.

The previous prime is 80139263. The next prime is 80139289. The reversal of 80139278 is 87293108.

It is a super-2 number, since 2×80139278² = 12844607756722568, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 25223 + ... + 28221.

It is an arithmetic number, because the mean of its divisors is an integer number (7776000).

Almost surely, 2^80139278 is an apocalyptic number.

80139278 is a deficient number, since it is larger than the sum of its proper divisors (44276722).

80139278 is a wasteful number, since it uses less digits than its factorization.

80139278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3463.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 80139278 is about 8952.0544010858. The cubic root of 80139278 is about 431.1368474960.

The spelling of 80139278 in words is "eighty million, one hundred thirty-nine thousand, two hundred seventy-eight".