33128400828 has 12 divisors (see below), whose sum is σ = 77299601960. Its totient is φ = 11042800272.

The previous prime is 33128400761. The next prime is 33128400853. The reversal of 33128400828 is 82800482133.

It is a tau number, because it is divible by the number of its divisors (12).

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, 1380350023 + ... + 1380350046.

Almost surely, 2^33128400828 is an apocalyptic number.

It is an amenable number.

33128400828 is an abundant number, since it is smaller than the sum of its proper divisors (44171201132).

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

33128400828 is a wasteful number, since it uses less digits than its factorization.

33128400828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760700076 (or 2760700074 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

It can be divided in two parts, 33 and 128400828, that multiplied together give a palindrome (4237227324).

The spelling of 33128400828 in words is "thirty-three billion, one hundred twenty-eight million, four hundred thousand, eight hundred twenty-eight".