985522780 has 72 divisors (see below), whose sum is σ = 2383017840. Its totient is φ = 339482880.

The previous prime is 985522739. The next prime is 985522807. The reversal of 985522780 is 87225589.

It is a self number, because there is not a number n which added to its sum of digits gives 985522780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73216 + ... + 85624.

It is an arithmetic number, because the mean of its divisors is an integer number (33097470).

Almost surely, 2^985522780 is an apocalyptic number.

985522780 is the 19855-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 985522780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1191508920).

985522780 is an abundant number, since it is smaller than the sum of its proper divisors (1397495060).

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

985522780 is a wasteful number, since it uses less digits than its factorization.

985522780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12467 (or 12446 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 985522780 is about 31393.0371260890. The cubic root of 985522780 is about 995.1507831051.

The spelling of 985522780 in words is "nine hundred eighty-five million, five hundred twenty-two thousand, seven hundred eighty".