68805540 has 36 divisors (see below), whose sum is σ = 208710684. Its totient is φ = 18348096.

The previous prime is 68805491. The next prime is 68805557. The reversal of 68805540 is 4550886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 38862756 + 29942784 = 6234^2 + 5472^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68805495 and 68805504.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 190947 + ... + 191306.

It is an arithmetic number, because the mean of its divisors is an integer number (5797519).

Almost surely, 2^68805540 is an apocalyptic number.

68805540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68805540 is an abundant number, since it is smaller than the sum of its proper divisors (139905144).

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

68805540 is a wasteful number, since it uses less digits than its factorization.

68805540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382268 (or 382263 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 68805540 is about 8294.9104877630. The cubic root of 68805540 is about 409.7709210095.

The spelling of 68805540 in words is "sixty-eight million, eight hundred five thousand, five hundred forty".