70064821 has 4 divisors (see below), whose sum is σ = 70314444. Its totient is φ = 69815200.

The previous prime is 70064779. The next prime is 70064833. The reversal of 70064821 is 12846007.

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 46648900 + 23415921 = 6830^2 + 4839^2 .

It is a cyclic number.

It is not a de Polignac number, because 70064821 - 2¹⁷ = 69933749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 70064821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70064851) by changing a digit.

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, 124390 + ... + 124951.

It is an arithmetic number, because the mean of its divisors is an integer number (17578611).

Almost surely, 2^70064821 is an apocalyptic number.

It is an amenable number.

70064821 is a deficient number, since it is larger than the sum of its proper divisors (249623).

70064821 is a wasteful number, since it uses less digits than its factorization.

70064821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249622.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 70064821 is about 8370.4731646425. The cubic root of 70064821 is about 412.2557030363.

The spelling of 70064821 in words is "seventy million, sixty-four thousand, eight hundred twenty-one".