863491860 has 384 divisors, whose sum is σ = 3528806400. Its totient is φ = 169827840.

The previous prime is 863491859. The next prime is 863491861. The reversal of 863491860 is 68194368.

863491860 is a `hidden beast` number, since 8 + 634 + 9 + 1 + 8 + 6 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (863491859) and next prime (863491861).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863491861) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 789474 + ... + 790566.

It is an arithmetic number, because the mean of its divisors is an integer number (9189600).

Almost surely, 2^863491860 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 863491860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1764403200).

863491860 is an abundant number, since it is smaller than the sum of its proper divisors (2665314540).

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

863491860 is a wasteful number, since it uses less digits than its factorization.

863491860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1140 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 863491860 is about 29385.2320052097. The cubic root of 863491860 is about 952.2538765157.

It can be divided in two parts, 86349 and 1860, that added together give a square (88209 = 297²).

The spelling of 863491860 in words is "eight hundred sixty-three million, four hundred ninety-one thousand, eight hundred sixty".