653533440 has 288 divisors, whose sum is σ = 2447698176. Its totient is φ = 145489920.

The previous prime is 653533417. The next prime is 653533493. The reversal of 653533440 is 44335356.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1101784 + ... + 1102376.

It is an arithmetic number, because the mean of its divisors is an integer number (8498952).

Almost surely, 2^653533440 is an apocalyptic number.

653533440 is a gapful number since it is divisible by the number (60) 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 653533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1223849088).

653533440 is an abundant number, since it is smaller than the sum of its proper divisors (1794164736).

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

653533440 is a wasteful number, since it uses less digits than its factorization.

653533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 33.

The square root of 653533440 is about 25564.3001077675. The cubic root of 653533440 is about 867.8059127021.

Adding to 653533440 its reverse (44335356), we get a palindrome (697868796).

The spelling of 653533440 in words is "six hundred fifty-three million, five hundred thirty-three thousand, four hundred forty".