70400009 has 4 divisors (see below), whose sum is σ = 74541204. Its totient is φ = 66258816.

The previous prime is 70400003. The next prime is 70400027. The reversal of 70400009 is 90000407.

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 63361600 + 7038409 = 7960^2 + 2653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70400009 is a prime.

It is a super-2 number, since 2×70400009² = 9912322534400162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70400003) 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, 2070572 + ... + 2070605.

It is an arithmetic number, because the mean of its divisors is an integer number (18635301).

Almost surely, 2^70400009 is an apocalyptic number.

It is an amenable number.

70400009 is a deficient number, since it is larger than the sum of its proper divisors (4141195).

70400009 is a wasteful number, since it uses less digits than its factorization.

70400009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141194.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 70400009 is about 8390.4713216839. The cubic root of 70400009 is about 412.9120637782.

The spelling of 70400009 in words is "seventy million, four hundred thousand, nine".