72145140 has 48 divisors (see below), whose sum is σ = 202934592. Its totient is φ = 19150336.

The previous prime is 72145121. The next prime is 72145163. The reversal of 72145140 is 4154127.

It is a self number, because there is not a number n which added to its sum of digits gives 72145140.

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 15 ways as a sum of consecutive naturals, for example, 10972 + ... + 16268.

It is an arithmetic number, because the mean of its divisors is an integer number (4227804).

Almost surely, 2^72145140 is an apocalyptic number.

It is an amenable number.

72145140 is an abundant number, since it is smaller than the sum of its proper divisors (130789452).

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

72145140 is a wasteful number, since it uses less digits than its factorization.

72145140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5536 (or 5534 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 72145140 is about 8493.8295250140. The cubic root of 72145140 is about 416.2961171388.

Adding to 72145140 its reverse (4154127), we get a palindrome (76299267).

The spelling of 72145140 in words is "seventy-two million, one hundred forty-five thousand, one hundred forty".