68915540 has 24 divisors (see below), whose sum is σ = 147178080. Its totient is φ = 27098528.

The previous prime is 68915533. The next prime is 68915557. The reversal of 68915540 is 4551986.

It is a junction number, because it is equal to n+sod(n) for n = 68915494 and 68915503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28022 + ... + 30381.

It is an arithmetic number, because the mean of its divisors is an integer number (6132420).

Almost surely, 2^68915540 is an apocalyptic number.

It is an amenable number.

68915540 is an abundant number, since it is smaller than the sum of its proper divisors (78262540).

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

68915540 is a wasteful number, since it uses less digits than its factorization.

68915540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58471 (or 58469 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 68915540 is about 8301.5384116440. The cubic root of 68915540 is about 409.9891728253.

The spelling of 68915540 in words is "sixty-eight million, nine hundred fifteen thousand, five hundred forty".