28325551 has 4 divisors (see below), whose sum is σ = 28606104. Its totient is φ = 28045000.

The previous prime is 28325543. The next prime is 28325567. The reversal of 28325551 is 15552382.

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

It is a cyclic number.

It is not a de Polignac number, because 28325551 - 2³ = 28325543 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 (28325951) 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, 140125 + ... + 140326.

It is an arithmetic number, because the mean of its divisors is an integer number (7151526).

Almost surely, 2^28325551 is an apocalyptic number.

28325551 is a deficient number, since it is larger than the sum of its proper divisors (280553).

28325551 is a wasteful number, since it uses less digits than its factorization.

28325551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280552.

The product of its digits is 12000, while the sum is 31.

The square root of 28325551 is about 5322.1754010931. The cubic root of 28325551 is about 304.8312279564.

The spelling of 28325551 in words is "twenty-eight million, three hundred twenty-five thousand, five hundred fifty-one".