66625760 has 96 divisors (see below), whose sum is σ = 165745440. Its totient is φ = 25274368.

The previous prime is 66625759. The next prime is 66625777. The reversal of 66625760 is 6752666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 385034 + ... + 385206.

It is an arithmetic number, because the mean of its divisors is an integer number (1726515).

Almost surely, 2^66625760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66625760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82872720).

66625760 is an abundant number, since it is smaller than the sum of its proper divisors (99119680).

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

66625760 is a wasteful number, since it uses less digits than its factorization.

66625760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 66625760 is about 8162.4604133803. The cubic root of 66625760 is about 405.3971818664.

The spelling of 66625760 in words is "sixty-six million, six hundred twenty-five thousand, seven hundred sixty".