68067540 has 60 divisors (see below), whose sum is σ = 213535476. Its totient is φ = 18150912.

The previous prime is 68067523. The next prime is 68067551. The reversal of 68067540 is 4576086.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15968016 + 52099524 = 3996^2 + 7218^2 .

It is a tau number, because it is divible by the number of its divisors (60).

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 = 68067495 and 68067504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19389 + ... + 22628.

Almost surely, 2^68067540 is an apocalyptic number.

68067540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68067540 is an abundant number, since it is smaller than the sum of its proper divisors (145467936).

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

68067540 is a wasteful number, since it uses less digits than its factorization.

68067540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42038 (or 42027 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 68067540 is about 8250.3054488910. The cubic root of 68067540 is about 408.3006002730.

The spelling of 68067540 in words is "sixty-eight million, sixty-seven thousand, five hundred forty".