70840809 has 12 divisors (see below), whose sum is σ = 110196996. Its totient is φ = 43594272.

The previous prime is 70840799. The next prime is 70840813. The reversal of 70840809 is 90804807.

It can be written as a sum of positive squares in 2 ways, for example, as 13505625 + 57335184 = 3675^2 + 7572^2 .

It is not a de Polignac number, because 70840809 - 2¹² = 70836713 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (70840009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 302622 + ... + 302855.

It is an arithmetic number, because the mean of its divisors is an integer number (9183083).

Almost surely, 2^70840809 is an apocalyptic number.

It is an amenable number.

70840809 is a deficient number, since it is larger than the sum of its proper divisors (39356187).

70840809 is a wasteful number, since it uses less digits than its factorization.

70840809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605496 (or 605493 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 70840809 is about 8416.6982243633. The cubic root of 70840809 is about 413.7720687504.

The spelling of 70840809 in words is "seventy million, eight hundred forty thousand, eight hundred nine".