70321680 has 240 divisors, whose sum is σ = 277857216. Its totient is φ = 15713280.

The previous prime is 70321663. The next prime is 70321681. The reversal of 70321680 is 8612307.

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (70321681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 102619 + ... + 103301.

Almost surely, 2^70321680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 70321680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138928608).

70321680 is an abundant number, since it is smaller than the sum of its proper divisors (207535536).

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

70321680 is a wasteful number, since it uses less digits than its factorization.

70321680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 70321680 is about 8385.8022871995. The cubic root of 70321680 is about 412.7588678144.

Adding to 70321680 its reverse (8612307), we get a palindrome (78933987).

The spelling of 70321680 in words is "seventy million, three hundred twenty-one thousand, six hundred eighty".