72561422 has 16 divisors (see below), whose sum is σ = 113959440. Its totient is φ = 34605312.

The previous prime is 72561407. The next prime is 72561427. The reversal of 72561422 is 22416527.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72561427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2723 + ... + 12350.

It is an arithmetic number, because the mean of its divisors is an integer number (7122465).

Almost surely, 2^72561422 is an apocalyptic number.

72561422 is a deficient number, since it is larger than the sum of its proper divisors (41398018).

72561422 is a wasteful number, since it uses less digits than its factorization.

72561422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15187.

The product of its digits is 6720, while the sum is 29.

The square root of 72561422 is about 8518.2992433936. The cubic root of 72561422 is about 417.0952669908.

Adding to 72561422 its reverse (22416527), we get a palindrome (94977949).

The spelling of 72561422 in words is "seventy-two million, five hundred sixty-one thousand, four hundred twenty-two".