68688864 has 96 divisors (see below), whose sum is σ = 202487040. Its totient is φ = 22651776.

The previous prime is 68688863. The next prime is 68688877. The reversal of 68688864 is 46888686.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×68688864² = 9436320075220992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 68688864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68688863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92077 + ... + 92819.

It is an arithmetic number, because the mean of its divisors is an integer number (2109240).

Almost surely, 2^68688864 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 68688864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101243520).

68688864 is an abundant number, since it is smaller than the sum of its proper divisors (133798176).

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

68688864 is a wasteful number, since it uses less digits than its factorization.

68688864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 869 (or 855 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 54.

The square root of 68688864 is about 8287.8745164246. The cubic root of 68688864 is about 409.5391689244.

The spelling of 68688864 in words is "sixty-eight million, six hundred eighty-eight thousand, eight hundred sixty-four".