66720532 has 12 divisors (see below), whose sum is σ = 120787380. Its totient is φ = 32209856.

The previous prime is 66720491. The next prime is 66720553. The reversal of 66720532 is 23502766.

66720532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16679056 + 50041476 = 4084^2 + 7074^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66720494 and 66720503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 287473 + ... + 287704.

It is an arithmetic number, because the mean of its divisors is an integer number (10065615).

Almost surely, 2^66720532 is an apocalyptic number.

It is an amenable number.

66720532 is a deficient number, since it is larger than the sum of its proper divisors (54066848).

66720532 is a wasteful number, since it uses less digits than its factorization.

66720532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575210 (or 575208 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 66720532 is about 8168.2637077900. The cubic root of 66720532 is about 405.5893102518.

The spelling of 66720532 in words is "sixty-six million, seven hundred twenty thousand, five hundred thirty-two".