70685991 has 6 divisors (see below), whose sum is σ = 102102000. Its totient is φ = 47123988.

The previous prime is 70685981. The next prime is 70685999. The reversal of 70685991 is 19958607.

It is not a de Polignac number, because 70685991 - 2⁵ = 70685959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70685999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3926991 + ... + 3927008.

It is an arithmetic number, because the mean of its divisors is an integer number (17017000).

Almost surely, 2^70685991 is an apocalyptic number.

70685991 is a deficient number, since it is larger than the sum of its proper divisors (31416009).

70685991 is a wasteful number, since it uses less digits than its factorization.

70685991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7854005 (or 7854002 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 70685991 is about 8407.4961195352. The cubic root of 70685991 is about 413.4704248832.

The spelling of 70685991 in words is "seventy million, six hundred eighty-five thousand, nine hundred ninety-one".