70306320 has 80 divisors (see below), whose sum is σ = 249091200. Its totient is φ = 16069632.

The previous prime is 70306309. The next prime is 70306363. The reversal of 70306320 is 2360307.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19245 + ... + 22604.

It is an arithmetic number, because the mean of its divisors is an integer number (3113640).

Almost surely, 2^70306320 is an apocalyptic number.

70306320 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

70306320 is an abundant number, since it is smaller than the sum of its proper divisors (178784880).

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

70306320 is a wasteful number, since it uses less digits than its factorization.

70306320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41872 (or 41866 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 70306320 is about 8384.8864035239. The cubic root of 70306320 is about 412.7288133662.

Adding to 70306320 its reverse (2360307), we get a palindrome (72666627).

The spelling of 70306320 in words is "seventy million, three hundred six thousand, three hundred twenty".