33402023440 has 80 divisors (see below), whose sum is σ = 78384701808. Its totient is φ = 13236635648.

The previous prime is 33402023357. The next prime is 33402023471. The reversal of 33402023440 is 4432020433.

It can be written as a sum of positive squares in 8 ways, for example, as 8021710096 + 25380313344 = 89564^2 + 159312^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×33402023440² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4051002 + ... + 4059238.

Almost surely, 2^33402023440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33402023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39192350904).

33402023440 is an abundant number, since it is smaller than the sum of its proper divisors (44982678368).

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

33402023440 is a wasteful number, since it uses less digits than its factorization.

33402023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8716 (or 8710 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 25.

Adding to 33402023440 its reverse (4432020433), we get a palindrome (37834043873).

The spelling of 33402023440 in words is "thirty-three billion, four hundred two million, twenty-three thousand, four hundred forty".