986561856 has 280 divisors, whose sum is σ = 3454009856. Its totient is φ = 272471040.

The previous prime is 986561837. The next prime is 986561869. The reversal of 986561856 is 658165689.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1124490 + ... + 1125366.

Almost surely, 2^986561856 is an apocalyptic number.

986561856 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 986561856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727004928).

986561856 is an abundant number, since it is smaller than the sum of its proper divisors (2467448000).

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

986561856 is a wasteful number, since it uses less digits than its factorization.

986561856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939 (or 920 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The square root of 986561856 is about 31409.5822321788. The cubic root of 986561856 is about 995.5004026573.

The spelling of 986561856 in words is "nine hundred eighty-six million, five hundred sixty-one thousand, eight hundred fifty-six".