864899120 has 20 divisors (see below), whose sum is σ = 2010890640. Its totient is φ = 345959616.

The previous prime is 864899081. The next prime is 864899131. The reversal of 864899120 is 21998468.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5405540 + ... + 5405699.

It is an arithmetic number, because the mean of its divisors is an integer number (100544532).

Almost surely, 2^864899120 is an apocalyptic number.

864899120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

864899120 is an abundant number, since it is smaller than the sum of its proper divisors (1145991520).

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

864899120 is a wasteful number, since it uses less digits than its factorization.

864899120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10811252 (or 10811246 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 864899120 is about 29409.1672782485. The cubic root of 864899120 is about 952.7709018352.

The spelling of 864899120 in words is "eight hundred sixty-four million, eight hundred ninety-nine thousand, one hundred twenty".