840521328 has 40 divisors (see below), whose sum is σ = 2172384768. Its totient is φ = 280039872.

The previous prime is 840521309. The next prime is 840521333. The reversal of 840521328 is 823125048.

It is a super-2 number, since 2×840521328² = 1412952205645767168, which contains 22 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 195975 + ... + 200217.

Almost surely, 2^840521328 is an apocalyptic number.

It is an amenable number.

840521328 is an abundant number, since it is smaller than the sum of its proper divisors (1331863440).

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

840521328 is a wasteful number, since it uses less digits than its factorization.

840521328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8381 (or 8375 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 840521328 is about 28991.7458598133. The cubic root of 840521328 is about 943.7339514076.

The spelling of 840521328 in words is "eight hundred forty million, five hundred twenty-one thousand, three hundred twenty-eight".