66532788 has 54 divisors (see below), whose sum is σ = 195643266. Its totient is φ = 19008864.

The previous prime is 66532787. The next prime is 66532793. The reversal of 66532788 is 88723566.

It can be written as a sum of positive squares in only one way, i.e., 66389904 + 142884 = 8148^2 + 378^2 .

It is a super-2 number, since 2×66532788² = 8853223758105888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66532787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17095 + ... + 20622.

Almost surely, 2^66532788 is an apocalyptic number.

It is an amenable number.

66532788 is an abundant number, since it is smaller than the sum of its proper divisors (129110478).

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

66532788 is a wasteful number, since it uses less digits than its factorization.

66532788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37741 (or 37729 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 66532788 is about 8156.7633286739. The cubic root of 66532788 is about 405.2085254468.

The spelling of 66532788 in words is "sixty-six million, five hundred thirty-two thousand, seven hundred eighty-eight".