72423146420 has 24 divisors (see below), whose sum is σ = 152098271304. Its totient is φ = 28967417856.

The previous prime is 72423146413. The next prime is 72423146437. The reversal of 72423146420 is 2464132427.

It can be written as a sum of positive squares in 4 ways, for example, as 14317079716 + 58106066704 = 119654^2 + 241052^2 .

It is a super-2 number, since 2×72423146420² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233312 + ... + 446408.

It is an arithmetic number, because the mean of its divisors is an integer number (6337427971).

Almost surely, 2^72423146420 is an apocalyptic number.

It is an amenable number.

72423146420 is an abundant number, since it is smaller than the sum of its proper divisors (79675124884).

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

72423146420 is a wasteful number, since it uses less digits than its factorization.

72423146420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230099 (or 230097 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

Adding to 72423146420 its reverse (2464132427), we get a palindrome (74887278847).

The spelling of 72423146420 in words is "seventy-two billion, four hundred twenty-three million, one hundred forty-six thousand, four hundred twenty".