8321707440 has 120 divisors (see below), whose sum is σ = 28597105680. Its totient is φ = 2167506432.

The previous prime is 8321707439. The next prime is 8321707517. The reversal of 8321707440 is 447071238.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8321707395 and 8321707404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103435 + ... + 165354.

It is an arithmetic number, because the mean of its divisors is an integer number (238309214).

Almost surely, 2^8321707440 is an apocalyptic number.

8321707440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8321707440 is an abundant number, since it is smaller than the sum of its proper divisors (20275398240).

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

8321707440 is a wasteful number, since it uses less digits than its factorization.

8321707440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268851 (or 268842 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 8321707440 is about 91223.3930524402. The cubic root of 8321707440 is about 2026.4574126538.

Adding to 8321707440 its reverse (447071238), we get a palindrome (8768778678).

The spelling of 8321707440 in words is "eight billion, three hundred twenty-one million, seven hundred seven thousand, four hundred forty".