28881437 has 8 divisors (see below), whose sum is σ = 31243296. Its totient is φ = 26539632.

The previous prime is 28881431. The next prime is 28881473. The reversal of 28881437 is 73418882.

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 28881437 - 2⁴ = 28881421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28881394 and 28881403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28881431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1943 + ... + 7844.

It is an arithmetic number, because the mean of its divisors is an integer number (3905412).

Almost surely, 2^28881437 is an apocalyptic number.

It is an amenable number.

28881437 is a deficient number, since it is larger than the sum of its proper divisors (2361859).

28881437 is a wasteful number, since it uses less digits than its factorization.

28881437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10027.

The product of its digits is 86016, while the sum is 41.

The square root of 28881437 is about 5374.1452343605. The cubic root of 28881437 is about 306.8124174586.

The spelling of 28881437 in words is "twenty-eight million, eight hundred eighty-one thousand, four hundred thirty-seven".