70213865 has 4 divisors (see below), whose sum is σ = 84256644. Its totient is φ = 56171088.

The previous prime is 70213849. The next prime is 70213877. The reversal of 70213865 is 56831207.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42198016 + 28015849 = 6496^2 + 5293^2 .

It is a cyclic number.

It is not a de Polignac number, because 70213865 - 2⁴ = 70213849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7021382 + ... + 7021391.

It is an arithmetic number, because the mean of its divisors is an integer number (21064161).

Almost surely, 2^70213865 is an apocalyptic number.

It is an amenable number.

70213865 is a deficient number, since it is larger than the sum of its proper divisors (14042779).

70213865 is a wasteful number, since it uses less digits than its factorization.

70213865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14042778.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 70213865 is about 8379.3713964712. The cubic root of 70213865 is about 412.5478169240.

The spelling of 70213865 in words is "seventy million, two hundred thirteen thousand, eight hundred sixty-five".