70809566 has 4 divisors (see below), whose sum is σ = 106214352. Its totient is φ = 35404782.

The previous prime is 70809559. The next prime is 70809569. The reversal of 70809566 is 66590807.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66590807 = 2851 ⋅23357.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70809569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17702390 + ... + 17702393.

It is an arithmetic number, because the mean of its divisors is an integer number (26553588).

Almost surely, 2^70809566 is an apocalyptic number.

70809566 is a deficient number, since it is larger than the sum of its proper divisors (35404786).

70809566 is a wasteful number, since it uses less digits than its factorization.

70809566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35404785.

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

The square root of 70809566 is about 8414.8420068353. The cubic root of 70809566 is about 413.7112310221.

The spelling of 70809566 in words is "seventy million, eight hundred nine thousand, five hundred sixty-six".