75071220 has 96 divisors (see below), whose sum is σ = 245403648. Its totient is φ = 16789632.

The previous prime is 75071219. The next prime is 75071221. The reversal of 75071220 is 2217057.

It is an interprime number because it is at equal distance from previous prime (75071219) and next prime (75071221).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75071221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17839 + ... + 21641.

It is an arithmetic number, because the mean of its divisors is an integer number (2556288).

Almost surely, 2^75071220 is an apocalyptic number.

75071220 is a gapful number since it is divisible by the number (70) 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 75071220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122701824).

75071220 is an abundant number, since it is smaller than the sum of its proper divisors (170332428).

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

75071220 is a wasteful number, since it uses less digits than its factorization.

75071220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3869 (or 3867 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 75071220 is about 8664.3649507624. The cubic root of 75071220 is about 421.8497776965.

Adding to 75071220 its reverse (2217057), we get a palindrome (77288277).

The spelling of 75071220 in words is "seventy-five million, seventy-one thousand, two hundred twenty".