68917644 has 18 divisors (see below), whose sum is σ = 174208580. Its totient is φ = 22972536.

The previous prime is 68917633. The next prime is 68917657. The reversal of 68917644 is 44671986.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 68917644.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 957154 + ... + 957225.

Almost surely, 2^68917644 is an apocalyptic number.

It is an amenable number.

68917644 is an abundant number, since it is smaller than the sum of its proper divisors (105290936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68917644 is a wasteful number, since it uses less digits than its factorization.

68917644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914389 (or 1914384 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 68917644 is about 8301.6651341764. The cubic root of 68917644 is about 409.9933451230.

It can be divided in two parts, 6891 and 7644, that added together give a triangular number (14535 = T₁₇₀).

The spelling of 68917644 in words is "sixty-eight million, nine hundred seventeen thousand, six hundred forty-four".