828138990 has 64 divisors (see below), whose sum is σ = 2275370496. Its totient is φ = 188963712.

The previous prime is 828138979. The next prime is 828139007. The reversal of 828138990 is 99831828.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131964 + ... + 138096.

It is an arithmetic number, because the mean of its divisors is an integer number (35552664).

Almost surely, 2^828138990 is an apocalyptic number.

828138990 is an abundant number, since it is smaller than the sum of its proper divisors (1447231506).

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

828138990 is a wasteful number, since it uses less digits than its factorization.

828138990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6793.

The product of its (nonzero) digits is 248832, while the sum is 48.

The square root of 828138990 is about 28777.4041567338. The cubic root of 828138990 is about 939.0767266198.

The spelling of 828138990 in words is "eight hundred twenty-eight million, one hundred thirty-eight thousand, nine hundred ninety".