28087542 has 48 divisors (see below), whose sum is σ = 71259552. Its totient is φ = 7827840.

The previous prime is 28087517. The next prime is 28087559. The reversal of 28087542 is 24578082.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28087497 and 28087506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2448 + ... + 7884.

It is an arithmetic number, because the mean of its divisors is an integer number (1484574).

Almost surely, 2^28087542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28087542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35629776).

28087542 is an abundant number, since it is smaller than the sum of its proper divisors (43172010).

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

28087542 is a wasteful number, since it uses less digits than its factorization.

28087542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5493 (or 5490 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 36.

The square root of 28087542 is about 5299.7681081345. The cubic root of 28087542 is about 303.9750311325.

The spelling of 28087542 in words is "twenty-eight million, eighty-seven thousand, five hundred forty-two".