28829381 has 8 divisors (see below), whose sum is σ = 33208320. Its totient is φ = 24515568.

The previous prime is 28829357. The next prime is 28829407. The reversal of 28829381 is 18392882.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-28829381 is a prime.

It is a super-2 number, since 2×28829381² = 1662266417686322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820381) 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, 15326 + ... + 17103.

It is an arithmetic number, because the mean of its divisors is an integer number (4151040).

Almost surely, 2^28829381 is an apocalyptic number.

It is an amenable number.

28829381 is a deficient number, since it is larger than the sum of its proper divisors (4378939).

28829381 is a wasteful number, since it uses less digits than its factorization.

28829381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32563.

The product of its digits is 55296, while the sum is 41.

The square root of 28829381 is about 5369.2998612482. The cubic root of 28829381 is about 306.6279733527.

The spelling of 28829381 in words is "twenty-eight million, eight hundred twenty-nine thousand, three hundred eighty-one".