78877831642 has 32 divisors (see below), whose sum is σ = 122649292800. Its totient is φ = 38005847040.

The previous prime is 78877831631. The next prime is 78877831649. The reversal of 78877831642 is 24613877887.

It is not an unprimeable number, because it can be changed into a prime (78877831649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15503223 + ... + 15508309.

It is an arithmetic number, because the mean of its divisors is an integer number (3832790400).

Almost surely, 2^78877831642 is an apocalyptic number.

78877831642 is a deficient number, since it is larger than the sum of its proper divisors (43771461158).

78877831642 is a wasteful number, since it uses less digits than its factorization.

78877831642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6126.

The product of its digits is 25288704, while the sum is 61.

The spelling of 78877831642 in words is "seventy-eight billion, eight hundred seventy-seven million, eight hundred thirty-one thousand, six hundred forty-two".