70009661 has 16 divisors (see below), whose sum is σ = 77155200. Its totient is φ = 63281088.

The previous prime is 70009619. The next prime is 70009669. The reversal of 70009661 is 16690007.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 70009661 - 2¹⁰ = 70008637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70009669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36320 + ... + 38198.

It is an arithmetic number, because the mean of its divisors is an integer number (4822200).

Almost surely, 2^70009661 is an apocalyptic number.

It is an amenable number.

70009661 is a deficient number, since it is larger than the sum of its proper divisors (7145539).

70009661 is a wasteful number, since it uses less digits than its factorization.

70009661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1988.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 70009661 is about 8367.1776006011. The cubic root of 70009661 is about 412.1474889836.

Adding to 70009661 its reverse (16690007), we get a palindrome (86699668).

It can be divided in two parts, 7000 and 9661, that added together give a palindrome (16661).

The spelling of 70009661 in words is "seventy million, nine thousand, six hundred sixty-one".