28840551 has 24 divisors (see below), whose sum is σ = 42603120. Its totient is φ = 17293056.

The previous prime is 28840549. The next prime is 28840561. The reversal of 28840551 is 15504882.

It is not a de Polignac number, because 28840551 - 2¹ = 28840549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26445 + ... + 27513.

It is an arithmetic number, because the mean of its divisors is an integer number (1775130).

Almost surely, 2^28840551 is an apocalyptic number.

28840551 is a deficient number, since it is larger than the sum of its proper divisors (13762569).

28840551 is a wasteful number, since it uses less digits than its factorization.

28840551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 28840551 is about 5370.3399333748. The cubic root of 28840551 is about 306.6675694418.

The spelling of 28840551 in words is "twenty-eight million, eight hundred forty thousand, five hundred fifty-one".