209142528 has 72 divisors (see below), whose sum is σ = 636158208. Its totient is φ = 59753472.

The previous prime is 209142503. The next prime is 209142539. The reversal of 209142528 is 825241902.

It is a nialpdrome in base 16.

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 7 ways as a sum of consecutive naturals, for example, 14076 + ... + 24827.

Almost surely, 2^209142528 is an apocalyptic number.

209142528 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

209142528 is an abundant number, since it is smaller than the sum of its proper divisors (427015680).

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

209142528 is an equidigital number, since it uses as much as digits as its factorization.

209142528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38929 (or 38915 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 209142528 is about 14461.7608886332. The cubic root of 209142528 is about 593.5820842548.

The spelling of 209142528 in words is "two hundred nine million, one hundred forty-two thousand, five hundred twenty-eight".