28021935 has 16 divisors (see below), whose sum is σ = 46785024. Its totient is φ = 14295072.

The previous prime is 28021919. The next prime is 28021943. The reversal of 28021935 is 53912082.

It is a happy number.

It is not a de Polignac number, because 28021935 - 2⁴ = 28021919 is a prime.

It is a super-2 number, since 2×28021935² = 1570457682288450, which contains 22 as substring.

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, 40267 + ... + 40956.

It is an arithmetic number, because the mean of its divisors is an integer number (2924064).

Almost surely, 2^28021935 is an apocalyptic number.

28021935 is a deficient number, since it is larger than the sum of its proper divisors (18763089).

28021935 is a wasteful number, since it uses less digits than its factorization.

28021935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81254.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 28021935 is about 5293.5748790397. The cubic root of 28021935 is about 303.7381712273.

The spelling of 28021935 in words is "twenty-eight million, twenty-one thousand, nine hundred thirty-five".