28274553 has 24 divisors (see below), whose sum is σ = 43524936. Its totient is φ = 17625600.

The previous prime is 28274551. The next prime is 28274569. The reversal of 28274553 is 35547282.

It can be written as a sum of positive squares in 4 ways, for example, as 1617984 + 26656569 = 1272^2 + 5163^2 .

It is not a de Polignac number, because 28274553 - 2¹ = 28274551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28274551) 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, 27183 + ... + 28203.

It is an arithmetic number, because the mean of its divisors is an integer number (1813539).

Almost surely, 2^28274553 is an apocalyptic number.

It is an amenable number.

28274553 is a deficient number, since it is larger than the sum of its proper divisors (15250383).

28274553 is a wasteful number, since it uses less digits than its factorization.

28274553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225 (or 1222 counting only the distinct ones).

The product of its digits is 67200, while the sum is 36.

The square root of 28274553 is about 5317.3821566632. The cubic root of 28274553 is about 304.6481762425.

The spelling of 28274553 in words is "twenty-eight million, two hundred seventy-four thousand, five hundred fifty-three".