33428187640 has 16 divisors (see below), whose sum is σ = 75213422280. Its totient is φ = 13371275040.

The previous prime is 33428187607. The next prime is 33428187671. The reversal of 33428187640 is 4678182433.

It is a super-2 number, since 2×33428187640² (a number of 22 digits) contains 22 as substring.

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, 417852306 + ... + 417852385.

Almost surely, 2^33428187640 is an apocalyptic number.

It is an amenable number.

33428187640 is an abundant number, since it is smaller than the sum of its proper divisors (41785234640).

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

33428187640 is a wasteful number, since it uses less digits than its factorization.

33428187640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835704702 (or 835704698 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 33428187640 in words is "thirty-three billion, four hundred twenty-eight million, one hundred eighty-seven thousand, six hundred forty".