28950381 has 12 divisors (see below), whose sum is σ = 43259580. Its totient is φ = 18634560.

The previous prime is 28950379. The next prime is 28950421. The reversal of 28950381 is 18305982.

It can be written as a sum of positive squares in 2 ways, for example, as 4536900 + 24413481 = 2130^2 + 4941^2 .

It is not a de Polignac number, because 28950381 - 2¹ = 28950379 is a prime.

It is a super-2 number, since 2×28950381² = 1676249120090322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28950301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55200 + ... + 55721.

It is an arithmetic number, because the mean of its divisors is an integer number (3604965).

Almost surely, 2^28950381 is an apocalyptic number.

It is an amenable number.

28950381 is a deficient number, since it is larger than the sum of its proper divisors (14309199).

28950381 is a wasteful number, since it uses less digits than its factorization.

28950381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110956 (or 110953 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28950381 is about 5380.5558263064. Note that the first 3 decimals coincide. The cubic root of 28950381 is about 307.0563580675.

The spelling of 28950381 in words is "twenty-eight million, nine hundred fifty thousand, three hundred eighty-one".