863556540 has 96 divisors (see below), whose sum is σ = 3014613504. Its totient is φ = 179439360.

The previous prime is 863556539. The next prime is 863556557. The reversal of 863556540 is 45655368.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 863556492 and 863556501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88839 + ... + 98078.

It is an arithmetic number, because the mean of its divisors is an integer number (31402224).

Almost surely, 2^863556540 is an apocalyptic number.

It is an amenable number.

863556540 is an abundant number, since it is smaller than the sum of its proper divisors (2151056964).

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

863556540 is a wasteful number, since it uses less digits than its factorization.

863556540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186947 (or 186945 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 42.

The square root of 863556540 is about 29386.3325374229. The cubic root of 863556540 is about 952.2776521666.

The spelling of 863556540 in words is "eight hundred sixty-three million, five hundred fifty-six thousand, five hundred forty".