66724620 has 24 divisors (see below), whose sum is σ = 186829104. Its totient is φ = 17793216.

The previous prime is 66724601. The next prime is 66724639. The reversal of 66724620 is 2642766.

66724620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66724601) and next prime (66724639).

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 7 ways as a sum of consecutive naturals, for example, 555979 + ... + 556098.

It is an arithmetic number, because the mean of its divisors is an integer number (7784546).

Almost surely, 2^66724620 is an apocalyptic number.

66724620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66724620 is an abundant number, since it is smaller than the sum of its proper divisors (120104484).

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

66724620 is a wasteful number, since it uses less digits than its factorization.

66724620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112089 (or 1112087 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 66724620 is about 8168.5139407361. The cubic root of 66724620 is about 405.5975936352.

The spelling of 66724620 in words is "sixty-six million, seven hundred twenty-four thousand, six hundred twenty".