133661428 has 24 divisors (see below), whose sum is σ = 246646400. Its totient is φ = 63203328.

The previous prime is 133661413. The next prime is 133661461. The reversal of 133661428 is 824166331.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 133661393 and 133661402.

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, 57301 + ... + 59587.

Almost surely, 2^133661428 is an apocalyptic number.

It is an amenable number.

133661428 is a deficient number, since it is larger than the sum of its proper divisors (112984972).

133661428 is a wasteful number, since it uses less digits than its factorization.

133661428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079 (or 3077 counting only the distinct ones).

The product of its digits is 20736, while the sum is 34.

The square root of 133661428 is about 11561.2035705631. The cubic root of 133661428 is about 511.2916484185.

The spelling of 133661428 in words is "one hundred thirty-three million, six hundred sixty-one thousand, four hundred twenty-eight".