72420121452 has 96 divisors (see below), whose sum is σ = 194667701760. Its totient is φ = 20525921280.

The previous prime is 72420121399. The next prime is 72420121469. The reversal of 72420121452 is 25412102427.

It is a super-2 number, since 2×72420121452² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24996868 + ... + 24999764.

It is an arithmetic number, because the mean of its divisors is an integer number (2027788560).

Almost surely, 2^72420121452 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 72420121452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97333850880).

72420121452 is an abundant number, since it is smaller than the sum of its proper divisors (122247580308).

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

72420121452 is a wasteful number, since it uses less digits than its factorization.

72420121452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191 (or 5189 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

Adding to 72420121452 its reverse (25412102427), we get a palindrome (97832223879).

The spelling of 72420121452 in words is "seventy-two billion, four hundred twenty million, one hundred twenty-one thousand, four hundred fifty-two".