861205776 has 40 divisors (see below), whose sum is σ = 2226476544. Its totient is φ = 286849920.

The previous prime is 861205753. The next prime is 861205777. The reversal of 861205776 is 677502168.

It is not an unprimeable number, because it can be changed into a prime (861205777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64510 + ... + 76706.

Almost surely, 2^861205776 is an apocalyptic number.

It is an amenable number.

861205776 is an abundant number, since it is smaller than the sum of its proper divisors (1365270768).

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

861205776 is a wasteful number, since it uses less digits than its factorization.

861205776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13679 (or 13673 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 861205776 is about 29346.3077064219. The cubic root of 861205776 is about 951.4127736957.

The spelling of 861205776 in words is "eight hundred sixty-one million, two hundred five thousand, seven hundred seventy-six".