858772890 has 36 divisors (see below), whose sum is σ = 2233532574. Its totient is φ = 228931968.

The previous prime is 858772883. The next prime is 858772891. The reversal of 858772890 is 98277858.

It can be written as a sum of positive squares in 3 ways, for example, as 857845521 + 927369 = 29289^2 + 963^2 .

It is not an unprimeable number, because it can be changed into a prime (858772891) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 276466 + ... + 279554.

Almost surely, 2^858772890 is an apocalyptic number.

858772890 is an abundant number, since it is smaller than the sum of its proper divisors (1374759684).

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

858772890 is an equidigital number, since it uses as much as digits as its factorization.

858772890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6191 (or 3099 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The square root of 858772890 is about 29304.8270767804. The cubic root of 858772890 is about 950.5160225177.

The spelling of 858772890 in words is "eight hundred fifty-eight million, seven hundred seventy-two thousand, eight hundred ninety".