66497428 has 12 divisors (see below), whose sum is σ = 116751712. Its totient is φ = 33139800.

The previous prime is 66497423. The next prime is 66497441. The reversal of 66497428 is 82479466.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66497423) 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, 25848 + ... + 28303.

Almost surely, 2^66497428 is an apocalyptic number.

It is an amenable number.

66497428 is a deficient number, since it is larger than the sum of its proper divisors (50254284).

66497428 is a wasteful number, since it uses less digits than its factorization.

66497428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54462 (or 54460 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The square root of 66497428 is about 8154.5955141871. The cubic root of 66497428 is about 405.1367277014.

The spelling of 66497428 in words is "sixty-six million, four hundred ninety-seven thousand, four hundred twenty-eight".