70687 has 2 divisors, whose sum is σ = 70688. Its totient is φ = 70686.

The previous prime is 70667. The next prime is 70709. The reversal of 70687 is 78607.

It is a weak prime.

It is an emirp because it is prime and its reverse (78607) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70687 - 2¹¹ = 68639 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35343 + 35344.

It is an arithmetic number, because the mean of its divisors is an integer number (35344).

2⁷⁰⁶⁸⁷ is an apocalyptic number.

70687 is the 154-th hex number.

70687 is a deficient number, since it is larger than the sum of its proper divisors (1).

70687 is an equidigital number, since it uses as much as digits as its factorization.

70687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 70687 is about 265.8702691163. The cubic root of 70687 is about 41.3472392221.

It can be divided in two parts, 70 and 687, that added together give a palindrome (757).

The spelling of 70687 in words is "seventy thousand, six hundred eighty-seven".