8321964728 has 48 divisors (see below), whose sum is σ = 19601337840. Its totient is φ = 3242321280.

The previous prime is 8321964727. The next prime is 8321964733. The reversal of 8321964728 is 8274691238.

It is a super-2 number, since 2×8321964728² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8321964727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 607301 + ... + 620852.

It is an arithmetic number, because the mean of its divisors is an integer number (408361205).

Almost surely, 2^8321964728 is an apocalyptic number.

8321964728 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

8321964728 is an abundant number, since it is smaller than the sum of its proper divisors (11279373112).

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

8321964728 is a wasteful number, since it uses less digits than its factorization.

8321964728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228188 (or 1228173 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 8321964728 is about 91224.8032499934. The cubic root of 8321964728 is about 2026.4782969016.

The spelling of 8321964728 in words is "eight billion, three hundred twenty-one million, nine hundred sixty-four thousand, seven hundred twenty-eight".