861800202 has 32 divisors (see below), whose sum is σ = 1998380160. Its totient is φ = 274776480.

The previous prime is 861800153. The next prime is 861800207. The reversal of 861800202 is 202008168.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (861800207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345699 + ... + 348182.

It is an arithmetic number, because the mean of its divisors is an integer number (62449380).

Almost surely, 2^861800202 is an apocalyptic number.

861800202 is an abundant number, since it is smaller than the sum of its proper divisors (1136579958).

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

861800202 is a wasteful number, since it uses less digits than its factorization.

861800202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693915 (or 693909 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 861800202 is about 29356.4337411750. The cubic root of 861800202 is about 951.6316197359.

The spelling of 861800202 in words is "eight hundred sixty-one million, eight hundred thousand, two hundred two".