66758620 has 12 divisors (see below), whose sum is σ = 140193144. Its totient is φ = 26703440.

The previous prime is 66758611. The next prime is 66758621. The reversal of 66758620 is 2685766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66758621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1668946 + ... + 1668985.

It is an arithmetic number, because the mean of its divisors is an integer number (11682762).

Almost surely, 2^66758620 is an apocalyptic number.

It is an amenable number.

66758620 is an abundant number, since it is smaller than the sum of its proper divisors (73434524).

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

66758620 is a wasteful number, since it uses less digits than its factorization.

66758620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3337940 (or 3337938 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 66758620 is about 8170.5948375868. The cubic root of 66758620 is about 405.6664736404. Note that the first 3 decimals are identical.

The spelling of 66758620 in words is "sixty-six million, seven hundred fifty-eight thousand, six hundred twenty".