861092020 has 48 divisors (see below), whose sum is σ = 1845708480. Its totient is φ = 337353984.

The previous prime is 861091997. The next prime is 861092069. The reversal of 861092020 is 20290168.

It is a happy number.

861092020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 861092020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361072 + ... + 363448.

It is an arithmetic number, because the mean of its divisors is an integer number (38452260).

Almost surely, 2^861092020 is an apocalyptic number.

It is an amenable number.

861092020 is an abundant number, since it is smaller than the sum of its proper divisors (984616460).

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

861092020 is a wasteful number, since it uses less digits than its factorization.

861092020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2752 (or 2750 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 861092020 is about 29344.3694769542. The cubic root of 861092020 is about 951.3708813938.

The spelling of 861092020 in words is "eight hundred sixty-one million, ninety-two thousand, twenty".