68563664 has 80 divisors (see below), whose sum is σ = 150407040. Its totient is φ = 30067200.

The previous prime is 68563657. The next prime is 68563673. The reversal of 68563664 is 46636586.

It is a super-2 number, since 2×68563664² = 9401952042209792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 453989 + ... + 454139.

It is an arithmetic number, because the mean of its divisors is an integer number (1880088).

Almost surely, 2^68563664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68563664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75203520).

68563664 is an abundant number, since it is smaller than the sum of its proper divisors (81843376).

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

68563664 is a wasteful number, since it uses less digits than its factorization.

68563664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 262 counting only the distinct ones).

The product of its digits is 622080, while the sum is 44.

The square root of 68563664 is about 8280.3178682947. The cubic root of 68563664 is about 409.2901936403.

The spelling of 68563664 in words is "sixty-eight million, five hundred sixty-three thousand, six hundred sixty-four".