528720138 has 24 divisors (see below), whose sum is σ = 1153807200. Its totient is φ = 174971304.

The previous prime is 528720119. The next prime is 528720161. The reversal of 528720138 is 831027825.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103158 + ... + 108161.

It is an arithmetic number, because the mean of its divisors is an integer number (48075300).

Almost surely, 2^528720138 is an apocalyptic number.

528720138 is an abundant number, since it is smaller than the sum of its proper divisors (625087062).

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

528720138 is a wasteful number, since it uses less digits than its factorization.

528720138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211466 (or 211463 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 528720138 is about 22993.9152386017. The cubic root of 528720138 is about 808.6152930655.

It can be divided in two parts, 5287 and 20138, that added together give a triangular number (25425 = T₂₂₅).

The spelling of 528720138 in words is "five hundred twenty-eight million, seven hundred twenty thousand, one hundred thirty-eight".