70566809 has 4 divisors (see below), whose sum is σ = 70877904. Its totient is φ = 70255716.

The previous prime is 70566763. The next prime is 70566841. The reversal of 70566809 is 90866507.

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.

It is a cyclic number.

It is not a de Polignac number, because 70566809 - 2¹⁶ = 70501273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70566109) 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, 155207 + ... + 155660.

It is an arithmetic number, because the mean of its divisors is an integer number (17719476).

Almost surely, 2^70566809 is an apocalyptic number.

It is an amenable number.

70566809 is a deficient number, since it is larger than the sum of its proper divisors (311095).

70566809 is a wasteful number, since it uses less digits than its factorization.

70566809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311094.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 70566809 is about 8400.4052878418. The cubic root of 70566809 is about 413.2379132116.

The spelling of 70566809 in words is "seventy million, five hundred sixty-six thousand, eight hundred nine".