70687213 has 4 divisors (see below), whose sum is σ = 72020988. Its totient is φ = 69353440.

The previous prime is 70687193. The next prime is 70687217. The reversal of 70687213 is 31278607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31278607 = 137 ⋅228311.

It can be written as a sum of positive squares in 2 ways, for example, as 31787044 + 38900169 = 5638^2 + 6237^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70687213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70687217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666808 + ... + 666913.

It is an arithmetic number, because the mean of its divisors is an integer number (18005247).

Almost surely, 2^70687213 is an apocalyptic number.

It is an amenable number.

70687213 is a deficient number, since it is larger than the sum of its proper divisors (1333775).

70687213 is a wasteful number, since it uses less digits than its factorization.

70687213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333774.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 70687213 is about 8407.5687924631. The cubic root of 70687213 is about 413.4728075239.

The spelling of 70687213 in words is "seventy million, six hundred eighty-seven thousand, two hundred thirteen".