28432655 has 4 divisors (see below), whose sum is σ = 34119192. Its totient is φ = 22746120.

The previous prime is 28432643. The next prime is 28432661. The reversal of 28432655 is 55623482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55623482 = 2 ⋅27811741.

It is not a de Polignac number, because 28432655 - 2¹² = 28428559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2843261 + ... + 2843270.

It is an arithmetic number, because the mean of its divisors is an integer number (8529798).

Almost surely, 2^28432655 is an apocalyptic number.

28432655 is a deficient number, since it is larger than the sum of its proper divisors (5686537).

28432655 is an equidigital number, since it uses as much as digits as its factorization.

28432655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5686536.

The product of its digits is 57600, while the sum is 35.

The square root of 28432655 is about 5332.2279583679. The cubic root of 28432655 is about 305.2149519416.

The spelling of 28432655 in words is "twenty-eight million, four hundred thirty-two thousand, six hundred fifty-five".