68571540 has 72 divisors (see below), whose sum is σ = 220245480. Its totient is φ = 17209344.

The previous prime is 68571539. The next prime is 68571571. The reversal of 68571540 is 4517586.

68571540 is a `hidden beast` number, since 68 + 57 + 1 + 540 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 15776784 + 52794756 = 3972^2 + 7266^2 .

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 = 68571495 and 68571504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8145 + ... + 14264.

It is an arithmetic number, because the mean of its divisors is an integer number (3058965).

Almost surely, 2^68571540 is an apocalyptic number.

68571540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68571540 is an abundant number, since it is smaller than the sum of its proper divisors (151673940).

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

68571540 is a wasteful number, since it uses less digits than its factorization.

68571540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22441 (or 22436 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 68571540 is about 8280.7934402447. The cubic root of 68571540 is about 409.3058649446.

The spelling of 68571540 in words is "sixty-eight million, five hundred seventy-one thousand, five hundred forty".