28059551 has 4 divisors (see below), whose sum is σ = 30217992. Its totient is φ = 25901112.

The previous prime is 28059547. The next prime is 28059553. The reversal of 28059551 is 15595082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15595082 = 2 ⋅7797541.

It is a cyclic number.

It is not a de Polignac number, because 28059551 - 2² = 28059547 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 (28059553) 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, 1079201 + ... + 1079226.

It is an arithmetic number, because the mean of its divisors is an integer number (7554498).

Almost surely, 2^28059551 is an apocalyptic number.

28059551 is a deficient number, since it is larger than the sum of its proper divisors (2158441).

28059551 is a wasteful number, since it uses less digits than its factorization.

28059551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158440.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 28059551 is about 5297.1266739620. The cubic root of 28059551 is about 303.8740208329.

The spelling of 28059551 in words is "twenty-eight million, fifty-nine thousand, five hundred fifty-one".