68321540 has 24 divisors (see below), whose sum is σ = 163972032. Its totient is φ = 23424480.

The previous prime is 68321531. The next prime is 68321557. The reversal of 68321540 is 4512386.

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, 243866 + ... + 244145.

It is an arithmetic number, because the mean of its divisors is an integer number (6832168).

Almost surely, 2^68321540 is an apocalyptic number.

It is an amenable number.

68321540 is an abundant number, since it is smaller than the sum of its proper divisors (95650492).

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

68321540 is a wasteful number, since it uses less digits than its factorization.

68321540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488027 (or 488025 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 68321540 is about 8265.6844846631. The cubic root of 68321540 is about 408.8078397017.

The spelling of 68321540 in words is "sixty-eight million, three hundred twenty-one thousand, five hundred forty".