68442864 has 160 divisors (see below), whose sum is σ = 217128960. Its totient is φ = 18144000.

The previous prime is 68442853. The next prime is 68442893. The reversal of 68442864 is 46824486.

It is a Harshad number since it is a multiple of its sum of digits (42).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 453189 + ... + 453339.

It is an arithmetic number, because the mean of its divisors is an integer number (1357056).

Almost surely, 2^68442864 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 68442864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108564480).

68442864 is an abundant number, since it is smaller than the sum of its proper divisors (148686096).

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

68442864 is a wasteful number, since it uses less digits than its factorization.

68442864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 253 counting only the distinct ones).

The product of its digits is 294912, while the sum is 42.

The square root of 68442864 is about 8273.0202465605. The cubic root of 68442864 is about 409.0496808193.

The spelling of 68442864 in words is "sixty-eight million, four hundred forty-two thousand, eight hundred sixty-four".