72145020 has 72 divisors (see below), whose sum is σ = 211263696. Its totient is φ = 18394112.

The previous prime is 72145019. The next prime is 72145057. The reversal of 72145020 is 2054127.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 30604 + ... + 32876.

It is an arithmetic number, because the mean of its divisors is an integer number (2934218).

Almost surely, 2^72145020 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 72145020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105631848).

72145020 is an abundant number, since it is smaller than the sum of its proper divisors (139118676).

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

72145020 is a wasteful number, since it uses less digits than its factorization.

72145020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2331 (or 2306 counting only the distinct ones).

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

The square root of 72145020 is about 8493.8224610596. The cubic root of 72145020 is about 416.2958863283.

Adding to 72145020 its reverse (2054127), we get a palindrome (74199147).

The spelling of 72145020 in words is "seventy-two million, one hundred forty-five thousand, twenty".