861989632 has 36 divisors (see below), whose sum is σ = 1966417936. Its totient is φ = 369423360.

The previous prime is 861989521. The next prime is 861989633. The reversal of 861989632 is 236989168.

It is a happy number.

It is a super-2 number, since 2×861989632² = 1486052251350990848, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861989632.

It is not an unprimeable number, because it can be changed into a prime (861989633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238719 + ... + 242302.

Almost surely, 2^861989632 is an apocalyptic number.

It is an amenable number.

861989632 is an abundant number, since it is smaller than the sum of its proper divisors (1104428304).

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

861989632 is an equidigital number, since it uses as much as digits as its factorization.

861989632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481044 (or 481030 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 52.

The square root of 861989632 is about 29359.6599435348. The cubic root of 861989632 is about 951.7013398291.

The spelling of 861989632 in words is "eight hundred sixty-one million, nine hundred eighty-nine thousand, six hundred thirty-two".