28262531 has 4 divisors (see below), whose sum is σ = 30831864. Its totient is φ = 25693200.

The previous prime is 28262513. The next prime is 28262537. The reversal of 28262531 is 13526282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28262531 - 2¹⁰ = 28261507 is a prime.

It is a super-2 number, since 2×28262531² = 1597541317051922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28262494 and 28262503.

It is not an unprimeable number, because it can be changed into a prime (28262537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1284650 + ... + 1284671.

It is an arithmetic number, because the mean of its divisors is an integer number (7707966).

Almost surely, 2^28262531 is an apocalyptic number.

28262531 is the 2378-th centered decagonal number.

28262531 is a deficient number, since it is larger than the sum of its proper divisors (2569333).

28262531 is a wasteful number, since it uses less digits than its factorization.

28262531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569332.

The product of its digits is 5760, while the sum is 29.

The square root of 28262531 is about 5316.2515929929. The cubic root of 28262531 is about 304.6049925410.

The spelling of 28262531 in words is "twenty-eight million, two hundred sixty-two thousand, five hundred thirty-one".