68529440 has 72 divisors (see below), whose sum is σ = 188355132. Its totient is φ = 23493120.

The previous prime is 68529427. The next prime is 68529449. The reversal of 68529440 is 4492586.

It can be written as a sum of positive squares in 2 ways, for example, as 64577296 + 3952144 = 8036^2 + 1988^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68529394 and 68529403.

It is not an unprimeable number, because it can be changed into a prime (68529449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3470 + ... + 12210.

Almost surely, 2^68529440 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 68529440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94177566).

68529440 is an abundant number, since it is smaller than the sum of its proper divisors (119825692).

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

68529440 is a wasteful number, since it uses less digits than its factorization.

68529440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8770 (or 8755 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 68529440 is about 8278.2510230120. The cubic root of 68529440 is about 409.2220823499. Note that the first 3 decimals are identical.

The spelling of 68529440 in words is "sixty-eight million, five hundred twenty-nine thousand, four hundred forty".