70840309 has 4 divisors (see below), whose sum is σ = 75007404. Its totient is φ = 66673216.

The previous prime is 70840249. The next prime is 70840339. The reversal of 70840309 is 90304807.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32524209 + 38316100 = 5703^2 + 6190^2 .

It is a cyclic number.

It is not a de Polignac number, because 70840309 - 2²⁵ = 37285877 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 (70840339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083522 + ... + 2083555.

It is an arithmetic number, because the mean of its divisors is an integer number (18751851).

Almost surely, 2^70840309 is an apocalyptic number.

It is an amenable number.

70840309 is a deficient number, since it is larger than the sum of its proper divisors (4167095).

70840309 is a wasteful number, since it uses less digits than its factorization.

70840309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167094.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 70840309 is about 8416.6685214519. The cubic root of 70840309 is about 413.7710952695.

The spelling of 70840309 in words is "seventy million, eight hundred forty thousand, three hundred nine".