28153557 has 6 divisors (see below), whose sum is σ = 40666262. Its totient is φ = 18769032.

The previous prime is 28153537. The next prime is 28153583. The reversal of 28153557 is 75535182.

It can be written as a sum of positive squares in only one way, i.e., 25310961 + 2842596 = 5031^2 + 1686^2 .

It is not a de Polignac number, because 28153557 - 2²⁴ = 11376341 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 (28153537) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1564078 + ... + 1564095.

Almost surely, 2^28153557 is an apocalyptic number.

It is an amenable number.

28153557 is a deficient number, since it is larger than the sum of its proper divisors (12512705).

28153557 is a wasteful number, since it uses less digits than its factorization.

28153557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3128179 (or 3128176 counting only the distinct ones).

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

The square root of 28153557 is about 5305.9925555922. The cubic root of 28153557 is about 304.2129920393.

The spelling of 28153557 in words is "twenty-eight million, one hundred fifty-three thousand, five hundred fifty-seven".