28353381 has 16 divisors (see below), whose sum is σ = 43728384. Its totient is φ = 16005744.

The previous prime is 28353373. The next prime is 28353397. The reversal of 28353381 is 18335382.

It is not a de Polignac number, because 28353381 - 2³ = 28353373 is a prime.

It is a super-2 number, since 2×28353381² = 1607828428262322, 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 (28353881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6391 + ... + 9876.

It is an arithmetic number, because the mean of its divisors is an integer number (2733024).

Almost surely, 2^28353381 is an apocalyptic number.

28353381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28353381 is a deficient number, since it is larger than the sum of its proper divisors (15375003).

28353381 is a wasteful number, since it uses less digits than its factorization.

28353381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16360.

The product of its digits is 17280, while the sum is 33.

The square root of 28353381 is about 5324.7892916058. The cubic root of 28353381 is about 304.9310280303.

It can be divided in two parts, 2835 and 3381, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 28353381 in words is "twenty-eight million, three hundred fifty-three thousand, three hundred eighty-one".