28534381 has 8 divisors (see below), whose sum is σ = 30275640. Its totient is φ = 26800128.

The previous prime is 28534369. The next prime is 28534417. The reversal of 28534381 is 18343582.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 22610025 + 5924356 = 4755^2 + 2434^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28534381 - 2⁵ = 28534349 is a prime.

It is a super-2 number, since 2×28534381² = 1628421798106322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28534301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8355 + ... + 11263.

It is an arithmetic number, because the mean of its divisors is an integer number (3784455).

Almost surely, 2^28534381 is an apocalyptic number.

It is an amenable number.

28534381 is a deficient number, since it is larger than the sum of its proper divisors (1741259).

28534381 is a wasteful number, since it uses less digits than its factorization.

28534381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503.

The product of its digits is 23040, while the sum is 34.

The square root of 28534381 is about 5341.7582311445. The cubic root of 28534381 is about 305.5785167881.

The spelling of 28534381 in words is "twenty-eight million, five hundred thirty-four thousand, three hundred eighty-one".