75220640 has 96 divisors (see below), whose sum is σ = 196680960. Its totient is φ = 26956800.

The previous prime is 75220627. The next prime is 75220681. The reversal of 75220640 is 4602257.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138770 + ... + 139310.

It is an arithmetic number, because the mean of its divisors is an integer number (2048760).

Almost surely, 2^75220640 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 75220640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98340480).

75220640 is an abundant number, since it is smaller than the sum of its proper divisors (121460320).

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

75220640 is a wasteful number, since it uses less digits than its factorization.

75220640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 75220640 is about 8672.9833390823. The cubic root of 75220640 is about 422.1294721888.

Adding to 75220640 its reverse (4602257), we get a palindrome (79822897).

The spelling of 75220640 in words is "seventy-five million, two hundred twenty thousand, six hundred forty".