72581370212 has 24 divisors (see below), whose sum is σ = 136859658936. Its totient is φ = 33481536768.

The previous prime is 72581370193. The next prime is 72581370229. The reversal of 72581370212 is 21207318527.

It can be written as a sum of positive squares in 4 ways, for example, as 29307385636 + 43273984576 = 171194^2 + 208024^2 .

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, 265343 + ... + 464294.

It is an arithmetic number, because the mean of its divisors is an integer number (5702485789).

Almost surely, 2^72581370212 is an apocalyptic number.

It is an amenable number.

72581370212 is a deficient number, since it is larger than the sum of its proper divisors (64278288724).

72581370212 is a wasteful number, since it uses less digits than its factorization.

72581370212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731567 (or 731565 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

Adding to 72581370212 its reverse (21207318527), we get a palindrome (93788688739).

The spelling of 72581370212 in words is "seventy-two billion, five hundred eighty-one million, three hundred seventy thousand, two hundred twelve".