28531755 has 48 divisors (see below), whose sum is σ = 57620160. Its totient is φ = 12789504.

The previous prime is 28531733. The next prime is 28531759. The reversal of 28531755 is 55713582.

It is not a de Polignac number, because 28531755 - 2⁶ = 28531691 is a prime.

It is a super-2 number, since 2×28531755² = 1628122086760050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28531759) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15841 + ... + 17549.

It is an arithmetic number, because the mean of its divisors is an integer number (1200420).

Almost surely, 2^28531755 is an apocalyptic number.

28531755 is an abundant number, since it is smaller than the sum of its proper divisors (29088405).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28531755 is a wasteful number, since it uses less digits than its factorization.

28531755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1780 (or 1777 counting only the distinct ones).

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

The square root of 28531755 is about 5341.5124262703. The cubic root of 28531755 is about 305.5691424384.

The spelling of 28531755 in words is "twenty-eight million, five hundred thirty-one thousand, seven hundred fifty-five".