70008581 has 4 divisors (see below), whose sum is σ = 72422700. Its totient is φ = 67594464.

The previous prime is 70008577. The next prime is 70008593. The reversal of 70008581 is 18580007.

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 11730625 + 58277956 = 3425^2 + 7634^2 .

It is a cyclic number.

It is not a de Polignac number, because 70008581 - 2² = 70008577 is a prime.

It is a super-2 number, since 2×70008581² = 9802402827267122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2414089 = 70008581 / (7 + 0 + 0 + 0 + 8 + 5 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70005581) 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, 1207016 + ... + 1207073.

It is an arithmetic number, because the mean of its divisors is an integer number (18105675).

Almost surely, 2^70008581 is an apocalyptic number.

It is an amenable number.

70008581 is a deficient number, since it is larger than the sum of its proper divisors (2414119).

70008581 is a wasteful number, since it uses less digits than its factorization.

70008581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414118.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 70008581 is about 8367.1130624607. The cubic root of 70008581 is about 412.1453696495.

Adding to 70008581 its reverse (18580007), we get a palindrome (88588588).

The spelling of 70008581 in words is "seventy million, eight thousand, five hundred eighty-one".