28528655 has 4 divisors (see below), whose sum is σ = 34234392. Its totient is φ = 22822920.

The previous prime is 28528639. The next prime is 28528657. The reversal of 28528655 is 55682582.

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

It is not a de Polignac number, because 28528655 - 2⁴ = 28528639 is a prime.

It is a super-2 number, since 2×28528655² = 1627768312218050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28528657) 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, 2852861 + ... + 2852870.

It is an arithmetic number, because the mean of its divisors is an integer number (8558598).

Almost surely, 2^28528655 is an apocalyptic number.

28528655 is a deficient number, since it is larger than the sum of its proper divisors (5705737).

28528655 is an equidigital number, since it uses as much as digits as its factorization.

28528655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705736.

The product of its digits is 192000, while the sum is 41.

The square root of 28528655 is about 5341.2222384020. Note that the first 4 decimals coincide. The cubic root of 28528655 is about 305.5580752532.

The spelling of 28528655 in words is "twenty-eight million, five hundred twenty-eight thousand, six hundred fifty-five".