865548642 has 144 divisors (see below), whose sum is σ = 2187235008. Its totient is φ = 227566080.

The previous prime is 865548631. The next prime is 865548653. The reversal of 865548642 is 246845568.

It is an interprime number because it is at equal distance from previous prime (865548631) and next prime (865548653).

It is a junction number, because it is equal to n+sod(n) for n = 865548591 and 865548600.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 5182843 + ... + 5183009.

It is an arithmetic number, because the mean of its divisors is an integer number (15189132).

Almost surely, 2^865548642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865548642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093617504).

865548642 is an abundant number, since it is smaller than the sum of its proper divisors (1321686366).

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

865548642 is a wasteful number, since it uses less digits than its factorization.

865548642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 257 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 48.

The square root of 865548642 is about 29420.2080550087. The cubic root of 865548642 is about 953.0093461418.

The spelling of 865548642 in words is "eight hundred sixty-five million, five hundred forty-eight thousand, six hundred forty-two".