28037530 has 16 divisors (see below), whose sum is σ = 51420744. Its totient is φ = 11003200.

The previous prime is 28037509. The next prime is 28037533. The reversal of 28037530 is 3573082.

It can be written as a sum of positive squares in 4 ways, for example, as 27994681 + 42849 = 5291^2 + 207^2 .

It is a super-2 number, since 2×28037530² = 1572206177001800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28037533) 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, 25921 + ... + 26980.

Almost surely, 2^28037530 is an apocalyptic number.

28037530 is a deficient number, since it is larger than the sum of its proper divisors (23383214).

28037530 is a wasteful number, since it uses less digits than its factorization.

28037530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52961.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 28037530 is about 5295.0476862820. The cubic root of 28037530 is about 303.7945070743.

The spelling of 28037530 in words is "twenty-eight million, thirty-seven thousand, five hundred thirty".