66260440 has 32 divisors (see below), whose sum is σ = 149320080. Its totient is φ = 26462592.

The previous prime is 66260431. The next prime is 66260471. The reversal of 66260440 is 4406266.

It is a junction number, because it is equal to n+sod(n) for n = 66260399 and 66260408.

It is a congruent number.

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, 43939 + ... + 45421.

Almost surely, 2^66260440 is an apocalyptic number.

It is an amenable number.

66260440 is an abundant number, since it is smaller than the sum of its proper divisors (83059640).

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

66260440 is a wasteful number, since it uses less digits than its factorization.

66260440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2611 (or 2607 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 66260440 is about 8140.0515968881. The cubic root of 66260440 is about 404.6548703287.

The spelling of 66260440 in words is "sixty-six million, two hundred sixty thousand, four hundred forty".