2028690 has 24 divisors (see below), whose sum is σ = 5274828. Its totient is φ = 540960.

The previous prime is 2028679. The next prime is 2028701. The reversal of 2028690 is 968202.

2028690 = 261² + 262² + ... + 287².

It is an interprime number because it is at equal distance from previous prime (2028679) and next prime (2028701).

It can be written as a sum of positive squares in 2 ways, for example, as 2013561 + 15129 = 1419^2 + 123^2 .

It is a super-2 number, since 2×2028690² = 8231166232200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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, 11181 + ... + 11360.

2^2028690 is an apocalyptic number.

2028690 is an abundant number, since it is smaller than the sum of its proper divisors (3246138).

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

2028690 is a wasteful number, since it uses less digits than its factorization.

2028690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22554 (or 22551 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2028690 is about 1424.3208908108. The cubic root of 2028690 is about 126.5916992529.

The spelling of 2028690 in words is "two million, twenty-eight thousand, six hundred ninety".