66887540 has 12 divisors (see below), whose sum is σ = 140463876. Its totient is φ = 26755008.

The previous prime is 66887531. The next prime is 66887551. The reversal of 66887540 is 4578866.

It can be written as a sum of positive squares in 2 ways, for example, as 38093584 + 28793956 = 6172^2 + 5366^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66887491 and 66887500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1672169 + ... + 1672208.

It is an arithmetic number, because the mean of its divisors is an integer number (11705323).

Almost surely, 2^66887540 is an apocalyptic number.

It is an amenable number.

66887540 is an abundant number, since it is smaller than the sum of its proper divisors (73576336).

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

66887540 is a wasteful number, since it uses less digits than its factorization.

66887540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344386 (or 3344384 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66887540 is about 8178.4802989308. The cubic root of 66887540 is about 405.9274381554.

The spelling of 66887540 in words is "sixty-six million, eight hundred eighty-seven thousand, five hundred forty".