28528061 has 4 divisors (see below), whose sum is σ = 28613052. Its totient is φ = 28443072.

The previous prime is 28528039. The next prime is 28528067. The reversal of 28528061 is 16082582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3976036 + 24552025 = 1994^2 + 4955^2 .

It is a cyclic number.

It is not a de Polignac number, because 28528061 - 2¹⁴ = 28511677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41990 + ... + 42663.

It is an arithmetic number, because the mean of its divisors is an integer number (7153263).

Almost surely, 2^28528061 is an apocalyptic number.

It is an amenable number.

28528061 is a deficient number, since it is larger than the sum of its proper divisors (84991).

28528061 is an equidigital number, since it uses as much as digits as its factorization.

28528061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84990.

The product of its (nonzero) digits is 7680, while the sum is 32.

The square root of 28528061 is about 5341.1666328622. The cubic root of 28528061 is about 305.5559545462. Note that the first 3 decimals are identical.

The spelling of 28528061 in words is "twenty-eight million, five hundred twenty-eight thousand, sixty-one".