84977769172 has 12 divisors (see below), whose sum is σ = 150244200820. Its totient is φ = 42050854656.

The previous prime is 84977769137. The next prime is 84977769179. The reversal of 84977769172 is 27196777948.

It can be written as a sum of positive squares in 2 ways, for example, as 27279807556 + 57697961616 = 165166^2 + 240204^2 .

It is a junction number, because it is equal to n+sod(n) for n = 84977769098 and 84977769107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84977769179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109507047 + ... + 109507822.

Almost surely, 2^84977769172 is an apocalyptic number.

It is an amenable number.

84977769172 is a deficient number, since it is larger than the sum of its proper divisors (65266431648).

84977769172 is a wasteful number, since it uses less digits than its factorization.

84977769172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219014970 (or 219014968 counting only the distinct ones).

The product of its digits is 74680704, while the sum is 67.

The spelling of 84977769172 in words is "eighty-four billion, nine hundred seventy-seven million, seven hundred sixty-nine thousand, one hundred seventy-two".