28550643 has 32 divisors (see below), whose sum is σ = 43411200. Its totient is φ = 16536960.

The previous prime is 28550617. The next prime is 28550647. The reversal of 28550643 is 34605582.

It is not a de Polignac number, because 28550643 - 2⁵ = 28550611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (28550647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81633 + ... + 81981.

It is an arithmetic number, because the mean of its divisors is an integer number (1356600).

Almost surely, 2^28550643 is an apocalyptic number.

28550643 is a deficient number, since it is larger than the sum of its proper divisors (14860557).

28550643 is a wasteful number, since it uses less digits than its factorization.

28550643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 28550643 is about 5343.2801723286. The cubic root of 28550643 is about 305.6365564108.

The spelling of 28550643 in words is "twenty-eight million, five hundred fifty thousand, six hundred forty-three".