66428694 has 32 divisors (see below), whose sum is σ = 148544640. Its totient is φ = 22004136.

The previous prime is 66428657. The next prime is 66428699. The reversal of 66428694 is 49682466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66428699) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5029 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (4642020).

Almost surely, 2^66428694 is an apocalyptic number.

66428694 is an abundant number, since it is smaller than the sum of its proper divisors (82115946).

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

66428694 is a wasteful number, since it uses less digits than its factorization.

66428694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7721 (or 7715 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 66428694 is about 8150.3799911415. The cubic root of 66428694 is about 404.9970918858.

The spelling of 66428694 in words is "sixty-six million, four hundred twenty-eight thousand, six hundred ninety-four".