861904800 has 360 divisors, whose sum is σ = 3221418816. Its totient is φ = 224156160.

The previous prime is 861904793. The next prime is 861904843. The reversal of 861904800 is 8409168.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3045459 + ... + 3045741.

Almost surely, 2^861904800 is an apocalyptic number.

861904800 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 861904800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1610709408).

861904800 is an abundant number, since it is smaller than the sum of its proper divisors (2359514016).

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

861904800 is a wasteful number, since it uses less digits than its factorization.

861904800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 861904800 is about 29358.2152046067. The cubic root of 861904800 is about 951.6701185036.

The spelling of 861904800 in words is "eight hundred sixty-one million, nine hundred four thousand, eight hundred".