133537032440 has 96 divisors (see below), whose sum is σ = 349667079120. Its totient is φ = 45763909632.

The previous prime is 133537032373. The next prime is 133537032449. The reversal of 133537032440 is 44230735331.

It is a super-2 number, since 2×133537032440² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 133537032440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133537032449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4821512 + ... + 4849128.

Almost surely, 2^133537032440 is an apocalyptic number.

133537032440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 133537032440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174833539560).

133537032440 is an abundant number, since it is smaller than the sum of its proper divisors (216130046680).

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

133537032440 is a wasteful number, since it uses less digits than its factorization.

133537032440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30109 (or 30098 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 35.

Adding to 133537032440 its reverse (44230735331), we get a palindrome (177767767771).

The spelling of 133537032440 in words is "one hundred thirty-three billion, five hundred thirty-seven million, thirty-two thousand, four hundred forty".