28531099 has 8 divisors (see below), whose sum is σ = 29610000. Its totient is φ = 27458592.

The previous prime is 28531093. The next prime is 28531123. The reversal of 28531099 is 99013582.

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-28531099 is a prime.

It is a super-2 number, since 2×28531099² = 1628047220295602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28531093) 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, 8712 + ... + 11530.

It is an arithmetic number, because the mean of its divisors is an integer number (3701250).

Almost surely, 2^28531099 is an apocalyptic number.

28531099 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28531099 is a deficient number, since it is larger than the sum of its proper divisors (1078901).

28531099 is a wasteful number, since it uses less digits than its factorization.

28531099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3197.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 28531099 is about 5341.4510200881. The cubic root of 28531099 is about 305.5668005461.

The spelling of 28531099 in words is "twenty-eight million, five hundred thirty-one thousand, ninety-nine".