861855248 has 20 divisors (see below), whose sum is σ = 1670508780. Its totient is φ = 430756224.

The previous prime is 861855233. The next prime is 861855277. The reversal of 861855248 is 842558168.

It can be written as a sum of positive squares in 2 ways, for example, as 510217744 + 351637504 = 22588^2 + 18752^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37286 + ... + 55802.

It is an arithmetic number, because the mean of its divisors is an integer number (83525439).

Almost surely, 2^861855248 is an apocalyptic number.

It is an amenable number.

861855248 is a deficient number, since it is larger than the sum of its proper divisors (808653532).

861855248 is a wasteful number, since it uses less digits than its factorization.

861855248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21434 (or 21428 counting only the distinct ones).

The product of its digits is 614400, while the sum is 47.

The square root of 861855248 is about 29357.3712719651. The cubic root of 861855248 is about 951.6518805801.

The spelling of 861855248 in words is "eight hundred sixty-one million, eight hundred fifty-five thousand, two hundred forty-eight".