77839489387 has 16 divisors (see below), whose sum is σ = 85371955200. Its totient is φ = 70383297600.

The previous prime is 77839489363. The next prime is 77839489391. The reversal of 77839489387 is 78398493877.

It is not a de Polignac number, because 77839489387 - 2²³ = 77831100779 is a prime.

It is a super-2 number, since 2×77839489387² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77839489397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10291087 + ... + 10298647.

It is an arithmetic number, because the mean of its divisors is an integer number (5335747200).

Almost surely, 2^77839489387 is an apocalyptic number.

77839489387 is a deficient number, since it is larger than the sum of its proper divisors (7532465813).

77839489387 is a wasteful number, since it uses less digits than its factorization.

77839489387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12474.

The product of its digits is 512096256, while the sum is 73.

The spelling of 77839489387 in words is "seventy-seven billion, eight hundred thirty-nine million, four hundred eighty-nine thousand, three hundred eighty-seven".