28735551 has 24 divisors (see below), whose sum is σ = 44881200. Its totient is φ = 17611776.

The previous prime is 28735529. The next prime is 28735573. The reversal of 28735551 is 15553782.

It is an interprime number because it is at equal distance from previous prime (28735529) and next prime (28735573).

It is not a de Polignac number, because 28735551 - 2⁹ = 28735039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28735951) 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, 52260 + ... + 52806.

It is an arithmetic number, because the mean of its divisors is an integer number (1870050).

Almost surely, 2^28735551 is an apocalyptic number.

28735551 is a deficient number, since it is larger than the sum of its proper divisors (16145649).

28735551 is a wasteful number, since it uses less digits than its factorization.

28735551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1012 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 28735551 is about 5360.5551018528. Note that the first 3 decimals coincide. The cubic root of 28735551 is about 306.2949546114.

The spelling of 28735551 in words is "twenty-eight million, seven hundred thirty-five thousand, five hundred fifty-one".