77865139 has 8 divisors (see below), whose sum is σ = 85080240. Its totient is φ = 70672800.

The previous prime is 77865127. The next prime is 77865157. The reversal of 77865139 is 93156877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77865139 - 2⁵ = 77865107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77865169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1917 + ... + 12625.

It is an arithmetic number, because the mean of its divisors is an integer number (10635030).

Almost surely, 2^77865139 is an apocalyptic number.

77865139 is a deficient number, since it is larger than the sum of its proper divisors (7215101).

77865139 is a wasteful number, since it uses less digits than its factorization.

77865139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11381.

The product of its digits is 317520, while the sum is 46.

The square root of 77865139 is about 8824.1225626121. The cubic root of 77865139 is about 427.0194803786.

The spelling of 77865139 in words is "seventy-seven million, eight hundred sixty-five thousand, one hundred thirty-nine".