28025551 has 8 divisors (see below), whose sum is σ = 30187520. Its totient is φ = 25932312.

The previous prime is 28025533. The next prime is 28025561. The reversal of 28025551 is 15552082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28025551 - 2¹¹ = 28023503 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 (28025561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16335 + ... + 17968.

It is an arithmetic number, because the mean of its divisors is an integer number (3773440).

Almost surely, 2^28025551 is an apocalyptic number.

28025551 is a deficient number, since it is larger than the sum of its proper divisors (2161969).

28025551 is a wasteful number, since it uses less digits than its factorization.

28025551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34365.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 28025551 is about 5293.9164141494. The cubic root of 28025551 is about 303.7512356354.

The spelling of 28025551 in words is "twenty-eight million, twenty-five thousand, five hundred fifty-one".