66473428 has 12 divisors (see below), whose sum is σ = 132946912. Its totient is φ = 28488600.

The previous prime is 66473413. The next prime is 66473431. The reversal of 66473428 is 82437466.

It is a happy number.

66473428 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186998 + ... + 1187053.

Almost surely, 2^66473428 is an apocalyptic number.

It is an amenable number.

66473428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66473428 is a wasteful number, since it uses less digits than its factorization.

66473428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2374062 (or 2374060 counting only the distinct ones).

The product of its digits is 193536, while the sum is 40.

The square root of 66473428 is about 8153.1238185128. The cubic root of 66473428 is about 405.0879816985.

The spelling of 66473428 in words is "sixty-six million, four hundred seventy-three thousand, four hundred twenty-eight".