861878570 has 32 divisors (see below), whose sum is σ = 1866326400. Its totient is φ = 279948096.

The previous prime is 861878533. The next prime is 861878617. The reversal of 861878570 is 75878168.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322685 + ... + 325344.

It is an arithmetic number, because the mean of its divisors is an integer number (58322700).

Almost surely, 2^861878570 is an apocalyptic number.

861878570 is an abundant number, since it is smaller than the sum of its proper divisors (1004447830).

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

861878570 is a wasteful number, since it uses less digits than its factorization.

861878570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648062.

The product of its (nonzero) digits is 752640, while the sum is 50.

The square root of 861878570 is about 29357.7684778663. The cubic root of 861878570 is about 951.6604644751.

The spelling of 861878570 in words is "eight hundred sixty-one million, eight hundred seventy-eight thousand, five hundred seventy".