78894279892 has 6 divisors (see below), whose sum is σ = 138064989818. Its totient is φ = 39447139944.

The previous prime is 78894279851. The next prime is 78894279929. The reversal of 78894279892 is 29897249887.

It can be written as a sum of positive squares in only one way, i.e., 58145605956 + 20748673936 = 241134^2 + 144044^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9861784983 + ... + 9861784990.

Almost surely, 2^78894279892 is an apocalyptic number.

It is an amenable number.

78894279892 is a deficient number, since it is larger than the sum of its proper divisors (59170709926).

78894279892 is a wasteful number, since it uses less digits than its factorization.

78894279892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19723569977 (or 19723569975 counting only the distinct ones).

The product of its digits is 292626432, while the sum is 73.

The spelling of 78894279892 in words is "seventy-eight billion, eight hundred ninety-four million, two hundred seventy-nine thousand, eight hundred ninety-two".