70219809 has 36 divisors (see below), whose sum is σ = 118076868. Its totient is φ = 40043520.

The previous prime is 70219783. The next prime is 70219811. The reversal of 70219809 is 90891207.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33350625 + 36869184 = 5775^2 + 6072^2 .

It is not a de Polignac number, because 70219809 - 2⁸ = 70219553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (70219109) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16617 + ... + 20409.

It is an arithmetic number, because the mean of its divisors is an integer number (3279913).

Almost surely, 2^70219809 is an apocalyptic number.

It is an amenable number.

70219809 is a deficient number, since it is larger than the sum of its proper divisors (47857059).

70219809 is a wasteful number, since it uses less digits than its factorization.

70219809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838 (or 3824 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 70219809 is about 8379.7260695085. The cubic root of 70219809 is about 412.5594580959.

The spelling of 70219809 in words is "seventy million, two hundred nineteen thousand, eight hundred nine".