70687687 has 4 divisors (see below), whose sum is σ = 80785936. Its totient is φ = 60589440.

The previous prime is 70687681. The next prime is 70687709. The reversal of 70687687 is 78678607.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 70687687 - 2³ = 70687679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 70687687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70687681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5049114 + ... + 5049127.

It is an arithmetic number, because the mean of its divisors is an integer number (20196484).

Almost surely, 2^70687687 is an apocalyptic number.

70687687 is a deficient number, since it is larger than the sum of its proper divisors (10098249).

70687687 is a wasteful number, since it uses less digits than its factorization.

70687687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10098248.

The product of its (nonzero) digits is 790272, while the sum is 49.

The square root of 70687687 is about 8407.5969813021. The cubic root of 70687687 is about 413.4737317159.

The spelling of 70687687 in words is "seventy million, six hundred eighty-seven thousand, six hundred eighty-seven".