861898320 has 200 divisors, whose sum is σ = 3124192896. Its totient is φ = 219808512.

The previous prime is 861898319. The next prime is 861898337. The reversal of 861898320 is 23898168.

861898320 is a `hidden beast` number, since 8 + 618 + 9 + 8 + 3 + 20 = 666.

861898320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 146149 + ... + 151931.

Almost surely, 2^861898320 is an apocalyptic number.

861898320 is a gapful number since it is divisible by the number (80) 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 861898320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1562096448).

861898320 is an abundant number, since it is smaller than the sum of its proper divisors (2262294576).

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

861898320 is a wasteful number, since it uses less digits than its factorization.

861898320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5831 (or 5816 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 861898320 is about 29358.1048434670. The cubic root of 861898320 is about 951.6677335388.

The spelling of 861898320 in words is "eight hundred sixty-one million, eight hundred ninety-eight thousand, three hundred twenty".