66987632 has 20 divisors (see below), whose sum is σ = 129921000. Its totient is φ = 33459648.

The previous prime is 66987631. The next prime is 66987653. The reversal of 66987632 is 23678966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66987631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22994 + ... + 25742.

It is an arithmetic number, because the mean of its divisors is an integer number (6496050).

Almost surely, 2^66987632 is an apocalyptic number.

It is an amenable number.

66987632 is a deficient number, since it is larger than the sum of its proper divisors (62933368).

66987632 is a wasteful number, since it uses less digits than its factorization.

66987632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4280 (or 4274 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 66987632 is about 8184.5972411598. The cubic root of 66987632 is about 406.1298168514.

The spelling of 66987632 in words is "sixty-six million, nine hundred eighty-seven thousand, six hundred thirty-two".