66867540 has 48 divisors (see below), whose sum is σ = 187841472. Its totient is φ = 17773056.

The previous prime is 66867469. The next prime is 66867557. The reversal of 66867540 is 4576866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66867492 and 66867501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18567 + ... + 21873.

It is an arithmetic number, because the mean of its divisors is an integer number (3913364).

Almost surely, 2^66867540 is an apocalyptic number.

66867540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66867540 is an abundant number, since it is smaller than the sum of its proper divisors (120973932).

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

66867540 is a wasteful number, since it uses less digits than its factorization.

66867540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3656 (or 3654 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 66867540 is about 8177.2574864682. The cubic root of 66867540 is about 405.8869754221.

The spelling of 66867540 in words is "sixty-six million, eight hundred sixty-seven thousand, five hundred forty".