70828709 has 4 divisors (see below), whose sum is σ = 80947104. Its totient is φ = 60710316.

The previous prime is 70828679. The next prime is 70828711. The reversal of 70828709 is 90782807.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 70828709 - 2⁸ = 70828453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70824709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5059187 + ... + 5059200.

It is an arithmetic number, because the mean of its divisors is an integer number (20236776).

Almost surely, 2^70828709 is an apocalyptic number.

It is an amenable number.

70828709 is a deficient number, since it is larger than the sum of its proper divisors (10118395).

70828709 is a wasteful number, since it uses less digits than its factorization.

70828709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10118394.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 70828709 is about 8415.9793844805. The cubic root of 70828709 is about 413.7485092269.

The spelling of 70828709 in words is "seventy million, eight hundred twenty-eight thousand, seven hundred nine".