84478981896 has 24 divisors (see below), whose sum is σ = 228797242830. Its totient is φ = 28159660608.

The previous prime is 84478981823. The next prime is 84478981901. The reversal of 84478981896 is 69818987448.

It is a happy number.

84478981896 is a `hidden beast` number, since 8 + 447 + 8 + 98 + 1 + 8 + 96 = 666.

It can be written as a sum of positive squares in only one way, i.e., 68337279396 + 16141702500 = 261414^2 + 127050^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (72), and also a Moran number because the ratio is a prime number: 1173319193 = 84478981896 / (8 + 4 + 4 + 7 + 8 + 9 + 8 + 1 + 8 + 9 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586659525 + ... + 586659668.

Almost surely, 2^84478981896 is an apocalyptic number.

It is an amenable number.

84478981896 is an abundant number, since it is smaller than the sum of its proper divisors (144318260934).

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

84478981896 is a wasteful number, since it uses less digits than its factorization.

84478981896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173319205 (or 1173319198 counting only the distinct ones).

The product of its digits is 222953472, while the sum is 72.

The spelling of 84478981896 in words is "eighty-four billion, four hundred seventy-eight million, nine hundred eighty-one thousand, eight hundred ninety-six".