863558256 has 80 divisors (see below), whose sum is σ = 2479662720. Its totient is φ = 256738560.

The previous prime is 863558251. The next prime is 863558291. The reversal of 863558256 is 652855368.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (863558251) 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, 12555 + ... + 43413.

It is an arithmetic number, because the mean of its divisors is an integer number (30995784).

Almost surely, 2^863558256 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 863558256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1239831360).

863558256 is an abundant number, since it is smaller than the sum of its proper divisors (1616104464).

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

863558256 is a wasteful number, since it uses less digits than its factorization.

863558256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30934 (or 30928 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 48.

The square root of 863558256 is about 29386.3617346551. The cubic root of 863558256 is about 952.2782829330.

The spelling of 863558256 in words is "eight hundred sixty-three million, five hundred fifty-eight thousand, two hundred fifty-six".