72561012 has 12 divisors (see below), whose sum is σ = 169309056. Its totient is φ = 24187000.

The previous prime is 72561011. The next prime is 72561017. The reversal of 72561012 is 21016527.

It is a tau number, because it is divible by the number of its divisors (12).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72561011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3023364 + ... + 3023387.

It is an arithmetic number, because the mean of its divisors is an integer number (14109088).

Almost surely, 2^72561012 is an apocalyptic number.

It is an amenable number.

72561012 is an abundant number, since it is smaller than the sum of its proper divisors (96748044).

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

72561012 is a wasteful number, since it uses less digits than its factorization.

72561012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6046758 (or 6046756 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 72561012 is about 8518.2751775227. The cubic root of 72561012 is about 417.0944814064.

Adding to 72561012 its reverse (21016527), we get a palindrome (93577539).

The spelling of 72561012 in words is "seventy-two million, five hundred sixty-one thousand, twelve".