70820809 has 8 divisors (see below), whose sum is σ = 75662240. Its totient is φ = 66090816.

The previous prime is 70820807. The next prime is 70820819. The reversal of 70820809 is 90802807.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 70820809 - 2¹ = 70820807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (70820801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26544 + ... + 29089.

It is an arithmetic number, because the mean of its divisors is an integer number (9457780).

Almost surely, 2^70820809 is an apocalyptic number.

It is an amenable number.

70820809 is a deficient number, since it is larger than the sum of its proper divisors (4841431).

70820809 is a wasteful number, since it uses less digits than its factorization.

70820809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55719.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 70820809 is about 8415.5100261363. The cubic root of 70820809 is about 413.7331259414.

The spelling of 70820809 in words is "seventy million, eight hundred twenty thousand, eight hundred nine".