68679440 has 40 divisors (see below), whose sum is σ = 161715840. Its totient is φ = 27121536.

The previous prime is 68679427. The next prime is 68679451. The reversal of 68679440 is 4497686.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 68679391 and 68679400.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 887 + ... + 11753.

It is an arithmetic number, because the mean of its divisors is an integer number (4042896).

Almost surely, 2^68679440 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 68679440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80857920).

68679440 is an abundant number, since it is smaller than the sum of its proper divisors (93036400).

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

68679440 is a wasteful number, since it uses less digits than its factorization.

68679440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10959 (or 10953 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 68679440 is about 8287.3059554960. The cubic root of 68679440 is about 409.5204386993.

The spelling of 68679440 in words is "sixty-eight million, six hundred seventy-nine thousand, four hundred forty".