28053531 has 12 divisors (see below), whose sum is σ = 44205720. Its totient is φ = 17002080.

The previous prime is 28053521. The next prime is 28053547. The reversal of 28053531 is 13535082.

28053531 is a `hidden beast` number, since 2 + 80 + 53 + 531 = 666.

It is not a de Polignac number, because 28053531 - 2⁹ = 28053019 is a prime.

It is a super-2 number, since 2×28053531² = 1574001203135922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28053495 and 28053504.

It is not an unprimeable number, because it can be changed into a prime (28053521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141586 + ... + 141783.

It is an arithmetic number, because the mean of its divisors is an integer number (3683810).

Almost surely, 2^28053531 is an apocalyptic number.

28053531 is a deficient number, since it is larger than the sum of its proper divisors (16152189).

28053531 is a wasteful number, since it uses less digits than its factorization.

28053531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283386 (or 283383 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 28053531 is about 5296.5584108929. The cubic root of 28053531 is about 303.8522878593.

It can be divided in two parts, 2805 and 3531, that added together give a palindrome (6336).

The spelling of 28053531 in words is "twenty-eight million, fifty-three thousand, five hundred thirty-one".