33640724028 has 24 divisors (see below), whose sum is σ = 79570299088. Its totient is φ = 11059963776.

The previous prime is 33640724027. The next prime is 33640724149. The reversal of 33640724028 is 82042704633.

It is a super-2 number, since 2×33640724028² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33640724027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19200451 + ... + 19202202.

Almost surely, 2^33640724028 is an apocalyptic number.

It is an amenable number.

33640724028 is an abundant number, since it is smaller than the sum of its proper divisors (45929575060).

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

33640724028 is a wasteful number, since it uses less digits than its factorization.

33640724028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38402733 (or 38402731 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 39.

The spelling of 33640724028 in words is "thirty-three billion, six hundred forty million, seven hundred twenty-four thousand, twenty-eight".