69707987 has 4 divisors (see below), whose sum is σ = 70093296. Its totient is φ = 69322680.

The previous prime is 69707977. The next prime is 69707999. The reversal of 69707987 is 78970796.

It is a happy number.

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 69707987 - 2⁸ = 69707731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69707977) 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 3 ways as a sum of consecutive naturals, for example, 192383 + ... + 192744.

It is an arithmetic number, because the mean of its divisors is an integer number (17523324).

Almost surely, 2^69707987 is an apocalyptic number.

69707987 is a deficient number, since it is larger than the sum of its proper divisors (385309).

69707987 is a wasteful number, since it uses less digits than its factorization.

69707987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385308.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The square root of 69707987 is about 8349.1309128555. The cubic root of 69707987 is about 411.5546508176.

The spelling of 69707987 in words is "sixty-nine million, seven hundred seven thousand, nine hundred eighty-seven".