72244551 has 8 divisors (see below), whose sum is σ = 96421104. Its totient is φ = 48115520.

The previous prime is 72244547. The next prime is 72244553. The reversal of 72244551 is 15544227.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72244551 - 2² = 72244547 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72244553) 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, 8166 + ... + 14531.

It is an arithmetic number, because the mean of its divisors is an integer number (12052638).

Almost surely, 2^72244551 is an apocalyptic number.

72244551 is a deficient number, since it is larger than the sum of its proper divisors (24176553).

72244551 is a wasteful number, since it uses less digits than its factorization.

72244551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23761.

The product of its digits is 11200, while the sum is 30.

The square root of 72244551 is about 8499.6794645445. The cubic root of 72244551 is about 416.4872384421.

Adding to 72244551 its reverse (15544227), we get a palindrome (87788778).

The spelling of 72244551 in words is "seventy-two million, two hundred forty-four thousand, five hundred fifty-one".