866028420 has 36 divisors (see below), whose sum is σ = 2626953420. Its totient is φ = 230940864.

The previous prime is 866028413. The next prime is 866028437. The reversal of 866028420 is 24820668.

866028420 is a `hidden beast` number, since 8 + 6 + 602 + 8 + 42 + 0 = 666.

866028420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 152176896 + 713851524 = 12336^2 + 26718^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2405455 + ... + 2405814.

Almost surely, 2^866028420 is an apocalyptic number.

It is an amenable number.

866028420 is an abundant number, since it is smaller than the sum of its proper divisors (1760925000).

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

866028420 is a wasteful number, since it uses less digits than its factorization.

866028420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811284 (or 4811279 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 866028420 is about 29428.3608106194. The cubic root of 866028420 is about 953.1853995872.

The spelling of 866028420 in words is "eight hundred sixty-six million, twenty-eight thousand, four hundred twenty".