84128807256 has 64 divisors (see below), whose sum is σ = 239824216800. Its totient is φ = 24363091968.

The previous prime is 84128807219. The next prime is 84128807291. The reversal of 84128807256 is 65270882148.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 84128807199 and 84128807208.

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, 7925391 + ... + 7935998.

Almost surely, 2^84128807256 is an apocalyptic number.

It is an amenable number.

84128807256 is an abundant number, since it is smaller than the sum of its proper divisors (155695409544).

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

84128807256 is a wasteful number, since it uses less digits than its factorization.

84128807256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15861428 (or 15861424 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 84128807256 in words is "eighty-four billion, one hundred twenty-eight million, eight hundred seven thousand, two hundred fifty-six".