70208661 has 4 divisors (see below), whose sum is σ = 93611552. Its totient is φ = 46805772.

The previous prime is 70208641. The next prime is 70208669. The reversal of 70208661 is 16680207.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16680207 = 3 ⋅5560069.

It is not a de Polignac number, because 70208661 - 2⁶ = 70208597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70208669) 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, 11701441 + ... + 11701446.

It is an arithmetic number, because the mean of its divisors is an integer number (23402888).

Almost surely, 2^70208661 is an apocalyptic number.

It is an amenable number.

70208661 is a deficient number, since it is larger than the sum of its proper divisors (23402891).

70208661 is a wasteful number, since it uses less digits than its factorization.

70208661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23402890.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 70208661 is about 8379.0608662308. The cubic root of 70208661 is about 412.5376244837.

Adding to 70208661 its reverse (16680207), we get a palindrome (86888868).

The spelling of 70208661 in words is "seventy million, two hundred eight thousand, six hundred sixty-one".