1228695687 has 6 divisors (see below), whose sum is σ = 1774782672. Its totient is φ = 819130452.

The previous prime is 1228695649. The next prime is 1228695691. The reversal of 1228695687 is 7865968221.

1228695687 is a `hidden beast` number, since 12 + 2 + 8 + 69 + 568 + 7 = 666.

It is not a de Polignac number, because 1228695687 - 2¹¹ = 1228693639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228695617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68260863 + ... + 68260880.

It is an arithmetic number, because the mean of its divisors is an integer number (295797112).

Almost surely, 2^1228695687 is an apocalyptic number.

1228695687 is a deficient number, since it is larger than the sum of its proper divisors (546086985).

1228695687 is a wasteful number, since it uses less digits than its factorization.

1228695687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136521749 (or 136521746 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1228695687 is about 35052.7557689834. The cubic root of 1228695687 is about 1071.0624108713.

The spelling of 1228695687 in words is "one billion, two hundred twenty-eight million, six hundred ninety-five thousand, six hundred eighty-seven".