72371551 has 16 divisors (see below), whose sum is σ = 87436800. Its totient is φ = 58516128.

The previous prime is 72371549. The next prime is 72371569. The reversal of 72371551 is 15517327.

It is a cyclic number.

It is not a de Polignac number, because 72371551 - 2¹ = 72371549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72371521) by changing a digit.

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, 33945 + ... + 36013.

It is an arithmetic number, because the mean of its divisors is an integer number (5464800).

Almost surely, 2^72371551 is an apocalyptic number.

72371551 is a deficient number, since it is larger than the sum of its proper divisors (15065249).

72371551 is a wasteful number, since it uses less digits than its factorization.

72371551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2358.

The product of its digits is 7350, while the sum is 31.

The square root of 72371551 is about 8507.1470540952. The cubic root of 72371551 is about 416.7311457191.

Adding to 72371551 its reverse (15517327), we get a palindrome (87888878).

The spelling of 72371551 in words is "seventy-two million, three hundred seventy-one thousand, five hundred fifty-one".