69640287 has 4 divisors (see below), whose sum is σ = 92853720. Its totient is φ = 46426856.

The previous prime is 69640273. The next prime is 69640289. The reversal of 69640287 is 78204696.

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 69640287 - 2¹⁰ = 69639263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69640289) 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, 11606712 + ... + 11606717.

It is an arithmetic number, because the mean of its divisors is an integer number (23213430).

Almost surely, 2^69640287 is an apocalyptic number.

69640287 is a deficient number, since it is larger than the sum of its proper divisors (23213433).

69640287 is a wasteful number, since it uses less digits than its factorization.

69640287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23213432.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 69640287 is about 8345.0756137976. The cubic root of 69640287 is about 411.4213744849.

The spelling of 69640287 in words is "sixty-nine million, six hundred forty thousand, two hundred eighty-seven".