28812551 has 8 divisors (see below), whose sum is σ = 29565120. Its totient is φ = 28065888.

The previous prime is 28812523. The next prime is 28812559. The reversal of 28812551 is 15521882.

It is a happy number.

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 28812551 - 2¹⁰ = 28811527 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 (28812559) 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, 9425 + ... + 12101.

It is an arithmetic number, because the mean of its divisors is an integer number (3695640).

Almost surely, 2^28812551 is an apocalyptic number.

28812551 is a deficient number, since it is larger than the sum of its proper divisors (752569).

28812551 is a wasteful number, since it uses less digits than its factorization.

28812551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953.

The product of its digits is 6400, while the sum is 32.

The square root of 28812551 is about 5367.7323890075. The cubic root of 28812551 is about 306.5682940355.

The spelling of 28812551 in words is "twenty-eight million, eight hundred twelve thousand, five hundred fifty-one".