68529640 has 32 divisors (see below), whose sum is σ = 154665000. Its totient is φ = 27327744.

The previous prime is 68529631. The next prime is 68529649. The reversal of 68529640 is 4692586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (68529631) and next prime (68529649).

It can be written as a sum of positive squares in 4 ways, for example, as 68525284 + 4356 = 8278^2 + 66^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 68529593 and 68529602.

It is not an unprimeable number, because it can be changed into a prime (68529649) by changing a digit.

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, 11506 + ... + 16414.

Almost surely, 2^68529640 is an apocalyptic number.

It is an amenable number.

68529640 is an abundant number, since it is smaller than the sum of its proper divisors (86135360).

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

68529640 is a wasteful number, since it uses less digits than its factorization.

68529640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5269 (or 5265 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 68529640 is about 8278.2631028495. The cubic root of 68529640 is about 409.2224804481. Note that the first 3 decimals are identical.

It can be divided in two parts, 68529 and 640, that added together give a square (69169 = 263²).

The spelling of 68529640 in words is "sixty-eight million, five hundred twenty-nine thousand, six hundred forty".