68640576 has 28 divisors (see below), whose sum is σ = 181612032. Its totient is φ = 22880128.

The previous prime is 68640571. The next prime is 68640581. The reversal of 68640576 is 67504686.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (68640571) and next prime (68640581).

It is a super-2 number, since 2×68640576² = 9423057347223552, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68640571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178560 + ... + 178943.

It is an arithmetic number, because the mean of its divisors is an integer number (6486144).

Almost surely, 2^68640576 is an apocalyptic number.

It is an amenable number.

68640576 is an abundant number, since it is smaller than the sum of its proper divisors (112971456).

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

68640576 is a wasteful number, since it uses less digits than its factorization.

68640576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357518 (or 357508 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 68640576 is about 8284.9608327378. The cubic root of 68640576 is about 409.4431782880.

The spelling of 68640576 in words is "sixty-eight million, six hundred forty thousand, five hundred seventy-six".