28542100 has 18 divisors (see below), whose sum is σ = 61936574. Its totient is φ = 11416800.

The previous prime is 28542089. The next prime is 28542131. The reversal of 28542100 is 124582.

It can be written as a sum of positive squares in 3 ways, for example, as 367236 + 28174864 = 606^2 + 5308^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 142611 + ... + 142810.

Almost surely, 2^28542100 is an apocalyptic number.

28542100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28542100 is an abundant number, since it is smaller than the sum of its proper divisors (33394474).

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

28542100 is a wasteful number, since it uses less digits than its factorization.

28542100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285435 (or 285428 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 28542100 is about 5342.4806972042. The cubic root of 28542100 is about 305.6060689063.

Adding to 28542100 its reverse (124582), we get a palindrome (28666682).

The spelling of 28542100 in words is "twenty-eight million, five hundred forty-two thousand, one hundred".