84991647984 has 80 divisors (see below), whose sum is σ = 232172473344. Its totient is φ = 26747942400.

The previous prime is 84991647971. The next prime is 84991647991. The reversal of 84991647984 is 48974619948.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635554 + ... + 757569.

Almost surely, 2^84991647984 is an apocalyptic number.

It is an amenable number.

84991647984 is an abundant number, since it is smaller than the sum of its proper divisors (147180825360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84991647984 is a wasteful number, since it uses less digits than its factorization.

84991647984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393206 (or 1393200 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 69.

The spelling of 84991647984 in words is "eighty-four billion, nine hundred ninety-one million, six hundred forty-seven thousand, nine hundred eighty-four".