68590640 has 40 divisors (see below), whose sum is σ = 161135520. Its totient is φ = 27150336.

The previous prime is 68590603. The next prime is 68590679. The reversal of 68590640 is 4609586.

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 = 68590594 and 68590603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3341 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (4028388).

Almost surely, 2^68590640 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 68590640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80567760).

68590640 is an abundant number, since it is smaller than the sum of its proper divisors (92544880).

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

68590640 is a wasteful number, since it uses less digits than its factorization.

68590640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8949 (or 8943 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 68590640 is about 8281.9466310765. The cubic root of 68590640 is about 409.3438642676.

The spelling of 68590640 in words is "sixty-eight million, five hundred ninety thousand, six hundred forty".