210890745 has 24 divisors (see below), whose sum is σ = 393663816. Its totient is φ = 103822848.

The previous prime is 210890731. The next prime is 210890753. The reversal of 210890745 is 547098012.

It can be written as a sum of positive squares in 4 ways, for example, as 147456 + 210743289 = 384^2 + 14517^2 .

It is not a de Polignac number, because 210890745 - 2¹⁴ = 210874361 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179664 + ... + 180833.

It is an arithmetic number, because the mean of its divisors is an integer number (16402659).

Almost surely, 2^210890745 is an apocalyptic number.

It is an amenable number.

210890745 is a deficient number, since it is larger than the sum of its proper divisors (182773071).

210890745 is a wasteful number, since it uses less digits than its factorization.

210890745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360521 (or 360518 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 210890745 is about 14522.0778471953. The cubic root of 210890745 is about 595.2314096463.

The spelling of 210890745 in words is "two hundred ten million, eight hundred ninety thousand, seven hundred forty-five".