68905540 has 24 divisors (see below), whose sum is σ = 157856832. Its totient is φ = 25056480.

The previous prime is 68905531. The next prime is 68905553. The reversal of 68905540 is 4550986.

It is a self number, because there is not a number n which added to its sum of digits gives 68905540.

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, 156384 + ... + 156823.

It is an arithmetic number, because the mean of its divisors is an integer number (6577368).

Almost surely, 2^68905540 is an apocalyptic number.

It is an amenable number.

68905540 is an abundant number, since it is smaller than the sum of its proper divisors (88951292).

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

68905540 is a wasteful number, since it uses less digits than its factorization.

68905540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313227 (or 313225 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 68905540 is about 8300.9360917911. The cubic root of 68905540 is about 409.9693413521.

The spelling of 68905540 in words is "sixty-eight million, nine hundred five thousand, five hundred forty".