861780830 has 16 divisors (see below), whose sum is σ = 1642453200. Its totient is φ = 324435072.

The previous prime is 861780817. The next prime is 861780839. The reversal of 861780830 is 38087168.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861780839) 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, 2534480 + ... + 2534819.

It is an arithmetic number, because the mean of its divisors is an integer number (102653325).

Almost surely, 2^861780830 is an apocalyptic number.

861780830 is a deficient number, since it is larger than the sum of its proper divisors (780672370).

861780830 is a wasteful number, since it uses less digits than its factorization.

861780830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5069323.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 861780830 is about 29356.1037946114. The cubic root of 861780830 is about 951.6244892564.

The spelling of 861780830 in words is "eight hundred sixty-one million, seven hundred eighty thousand, eight hundred thirty".