861155330 has 32 divisors (see below), whose sum is σ = 1789796736. Its totient is φ = 292207104.

The previous prime is 861155311. The next prime is 861155333. The reversal of 861155330 is 33551168.

It is not an unprimeable number, because it can be changed into a prime (861155333) 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, 56624 + ... + 70203.

It is an arithmetic number, because the mean of its divisors is an integer number (55931148).

Almost surely, 2^861155330 is an apocalyptic number.

861155330 is an abundant number, since it is smaller than the sum of its proper divisors (928641406).

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

861155330 is a wasteful number, since it uses less digits than its factorization.

861155330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126938.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 861155330 is about 29345.4481989967. The cubic root of 861155330 is about 951.3941966776.

The spelling of 861155330 in words is "eight hundred sixty-one million, one hundred fifty-five thousand, three hundred thirty".