28531542 has 32 divisors (see below), whose sum is σ = 65070432. Its totient is φ = 8262144.

The previous prime is 28531541. The next prime is 28531571. The reversal of 28531542 is 24513582.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9433 + ... + 12084.

It is an arithmetic number, because the mean of its divisors is an integer number (2033451).

Almost surely, 2^28531542 is an apocalyptic number.

28531542 is an abundant number, since it is smaller than the sum of its proper divisors (36538890).

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

28531542 is a wasteful number, since it uses less digits than its factorization.

28531542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21552.

The product of its digits is 9600, while the sum is 30.

The square root of 28531542 is about 5341.4924880599. The cubic root of 28531542 is about 305.5683820413.

The spelling of 28531542 in words is "twenty-eight million, five hundred thirty-one thousand, five hundred forty-two".