75533440 has 64 divisors (see below), whose sum is σ = 182424960. Its totient is φ = 29903872.

The previous prime is 75533387. The next prime is 75533441. The reversal of 75533440 is 4433557.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (75533441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67929 + ... + 69031.

It is an arithmetic number, because the mean of its divisors is an integer number (2850390).

Almost surely, 2^75533440 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 75533440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91212480).

75533440 is an abundant number, since it is smaller than the sum of its proper divisors (106891520).

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

75533440 is a wasteful number, since it uses less digits than its factorization.

75533440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 31.

The square root of 75533440 is about 8690.9976412377. The cubic root of 75533440 is about 422.7137953709.

Adding to 75533440 its reverse (4433557), we get a palindrome (79966997).

The spelling of 75533440 in words is "seventy-five million, five hundred thirty-three thousand, four hundred forty".