70587661 has 4 divisors (see below), whose sum is σ = 70946172. Its totient is φ = 70229152.

The previous prime is 70587631. The next prime is 70587697. The reversal of 70587661 is 16678507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16678507 = 443 ⋅37649.

It can be written as a sum of positive squares in 2 ways, for example, as 34515625 + 36072036 = 5875^2 + 6006^2 .

It is a cyclic number.

It is not a de Polignac number, because 70587661 - 2⁷ = 70587533 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70587631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178960 + ... + 179353.

It is an arithmetic number, because the mean of its divisors is an integer number (17736543).

Almost surely, 2^70587661 is an apocalyptic number.

It is an amenable number.

70587661 is a deficient number, since it is larger than the sum of its proper divisors (358511).

70587661 is a wasteful number, since it uses less digits than its factorization.

70587661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358510.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 70587661 is about 8401.6463267624. The cubic root of 70587661 is about 413.2786121771.

The spelling of 70587661 in words is "seventy million, five hundred eighty-seven thousand, six hundred sixty-one".