66616782 has 32 divisors (see below), whose sum is σ = 136252800. Its totient is φ = 21706848.

The previous prime is 66616721. The next prime is 66616843. The reversal of 66616782 is 28761666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (66616721) and next prime (66616843).

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, 79944 + ... + 80772.

It is an arithmetic number, because the mean of its divisors is an integer number (4257900).

Almost surely, 2^66616782 is an apocalyptic number.

66616782 is an abundant number, since it is smaller than the sum of its proper divisors (69636018).

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

66616782 is a wasteful number, since it uses less digits than its factorization.

66616782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its digits is 145152, while the sum is 42.

The square root of 66616782 is about 8161.9104381266. The cubic root of 66616782 is about 405.3789715956.

The spelling of 66616782 in words is "sixty-six million, six hundred sixteen thousand, seven hundred eighty-two".