66705726 has 16 divisors (see below), whose sum is σ = 134659584. Its totient is φ = 22027224.

The previous prime is 66705703. The next prime is 66705761. The reversal of 66705726 is 62750766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51310 + ... + 52593.

It is an arithmetic number, because the mean of its divisors is an integer number (8416224).

Almost surely, 2^66705726 is an apocalyptic number.

66705726 is an abundant number, since it is smaller than the sum of its proper divisors (67953858).

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

66705726 is a wasteful number, since it uses less digits than its factorization.

66705726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104015.

The product of its (nonzero) digits is 105840, while the sum is 39.

The square root of 66705726 is about 8167.3573449433. The cubic root of 66705726 is about 405.5593064963.

The spelling of 66705726 in words is "sixty-six million, seven hundred five thousand, seven hundred twenty-six".