70809657 has 8 divisors (see below), whose sum is σ = 94684800. Its totient is φ = 47070480.

The previous prime is 70809653. The next prime is 70809659. The reversal of 70809657 is 75690807.

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

It is not a de Polignac number, because 70809657 - 2² = 70809653 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (70809653) 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, 32769 + ... + 34862.

It is an arithmetic number, because the mean of its divisors is an integer number (11835600).

Almost surely, 2^70809657 is an apocalyptic number.

It is an amenable number.

70809657 is a deficient number, since it is larger than the sum of its proper divisors (23875143).

70809657 is a wasteful number, since it uses less digits than its factorization.

70809657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67983.

The product of its (nonzero) digits is 105840, while the sum is 42.

The square root of 70809657 is about 8414.8474139464. The cubic root of 70809657 is about 413.7114082472.

The spelling of 70809657 in words is "seventy million, eight hundred nine thousand, six hundred fifty-seven".