28837993 has 8 divisors (see below), whose sum is σ = 29916128. Its totient is φ = 27778464.

The previous prime is 28837987. The next prime is 28838009. The reversal of 28837993 is 39973882.

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 28837993 - 2²¹ = 26740841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28837943) 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, 1455 + ... + 7732.

It is an arithmetic number, because the mean of its divisors is an integer number (3739516).

Almost surely, 2^28837993 is an apocalyptic number.

It is an amenable number.

28837993 is a deficient number, since it is larger than the sum of its proper divisors (1078135).

28837993 is an equidigital number, since it uses as much as digits as its factorization.

28837993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9303.

The product of its digits is 653184, while the sum is 49.

The square root of 28837993 is about 5370.1017681232. The cubic root of 28837993 is about 306.6585025919.

The spelling of 28837993 in words is "twenty-eight million, eight hundred thirty-seven thousand, nine hundred ninety-three".