75221400 has 96 divisors (see below), whose sum is σ = 234538560. Its totient is φ = 19943040.

The previous prime is 75221383. The next prime is 75221411. The reversal of 75221400 is 412257.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169579 + ... + 170021.

It is an arithmetic number, because the mean of its divisors is an integer number (2443110).

Almost surely, 2^75221400 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 75221400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117269280).

75221400 is an abundant number, since it is smaller than the sum of its proper divisors (159317160).

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

75221400 is a wasteful number, since it uses less digits than its factorization.

75221400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745 (or 736 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 75221400 is about 8673.0271531917. The cubic root of 75221400 is about 422.1308938612.

Adding to 75221400 its reverse (412257), we get a palindrome (75633657).

The spelling of 75221400 in words is "seventy-five million, two hundred twenty-one thousand, four hundred".