70909687 has 4 divisors (see below), whose sum is σ = 71007160. Its totient is φ = 70812216.

The previous prime is 70909661. The next prime is 70909711. The reversal of 70909687 is 78690907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78690907 = 757 ⋅103951.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70909687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70909607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47637 + ... + 49102.

It is an arithmetic number, because the mean of its divisors is an integer number (17751790).

Almost surely, 2^70909687 is an apocalyptic number.

70909687 is a deficient number, since it is larger than the sum of its proper divisors (97473).

70909687 is an equidigital number, since it uses as much as digits as its factorization.

70909687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97472.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 70909687 is about 8420.7889772871. The cubic root of 70909687 is about 413.9061278294.

The spelling of 70909687 in words is "seventy million, nine hundred nine thousand, six hundred eighty-seven".