66715420 has 12 divisors (see below), whose sum is σ = 140102424. Its totient is φ = 26686160.

The previous prime is 66715417. The next prime is 66715427. The reversal of 66715420 is 2451766.

It is a happy number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66715427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667866 + ... + 1667905.

It is an arithmetic number, because the mean of its divisors is an integer number (11675202).

Almost surely, 2^66715420 is an apocalyptic number.

It is an amenable number.

66715420 is an abundant number, since it is smaller than the sum of its proper divisors (73387004).

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

66715420 is a wasteful number, since it uses less digits than its factorization.

66715420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335780 (or 3335778 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 66715420 is about 8167.9507833973. The cubic root of 66715420 is about 405.5789514939.

The spelling of 66715420 in words is "sixty-six million, seven hundred fifteen thousand, four hundred twenty".