861943428 has 36 divisors (see below), whose sum is σ = 2229475248. Its totient is φ = 280632240.

The previous prime is 861943427. The next prime is 861943441. The reversal of 861943428 is 824349168.

It is a happy number.

861943428 is a `hidden beast` number, since 8 + 619 + 4 + 3 + 4 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (861943427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 276858 + ... + 279953.

It is an arithmetic number, because the mean of its divisors is an integer number (61929868).

Almost surely, 2^861943428 is an apocalyptic number.

It is an amenable number.

861943428 is an abundant number, since it is smaller than the sum of its proper divisors (1367531820).

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

861943428 is a wasteful number, since it uses less digits than its factorization.

861943428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556864 (or 556859 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 861943428 is about 29358.8730710155. The cubic root of 861943428 is about 951.6843352957.

The spelling of 861943428 in words is "eight hundred sixty-one million, nine hundred forty-three thousand, four hundred twenty-eight".