28755381 has 8 divisors (see below), whose sum is σ = 40595904. Its totient is φ = 18042560.

The previous prime is 28755373. The next prime is 28755403. The reversal of 28755381 is 18355782.

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 28755381 - 2³ = 28755373 is a prime.

It is a super-2 number, since 2×28755381² = 1653743872910322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28755281) 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, 281865 + ... + 281966.

It is an arithmetic number, because the mean of its divisors is an integer number (5074488).

Almost surely, 2^28755381 is an apocalyptic number.

It is an amenable number.

28755381 is a deficient number, since it is larger than the sum of its proper divisors (11840523).

28755381 is a wasteful number, since it uses less digits than its factorization.

28755381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563851.

The product of its digits is 67200, while the sum is 39.

The square root of 28755381 is about 5362.4044047423. The cubic root of 28755381 is about 306.3653950254.

It can be divided in two parts, 2875 and 5381, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 28755381 in words is "twenty-eight million, seven hundred fifty-five thousand, three hundred eighty-one".