863904280 has 64 divisors (see below), whose sum is σ = 2012371200. Its totient is φ = 333434880.

The previous prime is 863904257. The next prime is 863904281. The reversal of 863904280 is 82409368.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863904281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 536116 + ... + 537724.

It is an arithmetic number, because the mean of its divisors is an integer number (31443300).

Almost surely, 2^863904280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 863904280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006185600).

863904280 is an abundant number, since it is smaller than the sum of its proper divisors (1148466920).

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

863904280 is a wasteful number, since it uses less digits than its factorization.

863904280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 863904280 is about 29392.2486380338. The cubic root of 863904280 is about 952.4054571901.

The spelling of 863904280 in words is "eight hundred sixty-three million, nine hundred four thousand, two hundred eighty".