66906726 has 16 divisors (see below), whose sum is σ = 133921200. Its totient is φ = 22284288.

The previous prime is 66906703. The next prime is 66906737. The reversal of 66906726 is 62760966.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5190 + ... + 12678.

It is an arithmetic number, because the mean of its divisors is an integer number (8370075).

Almost surely, 2^66906726 is an apocalyptic number.

66906726 is an abundant number, since it is smaller than the sum of its proper divisors (67014474).

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

66906726 is a wasteful number, since it uses less digits than its factorization.

66906726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8983.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 66906726 is about 8179.6531711314. The cubic root of 66906726 is about 405.9662464760.

Subtracting from 66906726 its reverse (62760966), we obtain a triangular number (4145760 = T₂₈₇₉).

The spelling of 66906726 in words is "sixty-six million, nine hundred six thousand, seven hundred twenty-six".