66306540 has 24 divisors (see below), whose sum is σ = 185658480. Its totient is φ = 17681728.

The previous prime is 66306529. The next prime is 66306577. The reversal of 66306540 is 4560366.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66306498 and 66306507.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552495 + ... + 552614.

It is an arithmetic number, because the mean of its divisors is an integer number (7735770).

Almost surely, 2^66306540 is an apocalyptic number.

66306540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66306540 is an abundant number, since it is smaller than the sum of its proper divisors (119351940).

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

66306540 is a wasteful number, since it uses less digits than its factorization.

66306540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105121 (or 1105119 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 66306540 is about 8142.8827819145. The cubic root of 66306540 is about 404.7486933547.

The spelling of 66306540 in words is "sixty-six million, three hundred six thousand, five hundred forty".