70728313 has 8 divisors (see below), whose sum is σ = 75916008. Its totient is φ = 65654784.

The previous prime is 70728311. The next prime is 70728323. The reversal of 70728313 is 31382707.

It can be written as a sum of positive squares in 4 ways, for example, as 32684089 + 38044224 = 5717^2 + 6168^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 70728313 - 2¹ = 70728311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70728311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27256 + ... + 29737.

It is an arithmetic number, because the mean of its divisors is an integer number (9489501).

Almost surely, 2^70728313 is an apocalyptic number.

70728313 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

It is an amenable number.

70728313 is a deficient number, since it is larger than the sum of its proper divisors (5187695).

70728313 is a wasteful number, since it uses less digits than its factorization.

70728313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57083.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 70728313 is about 8410.0126634863. The cubic root of 70728313 is about 413.5529278132.

The spelling of 70728313 in words is "seventy million, seven hundred twenty-eight thousand, three hundred thirteen".