72538551 has 16 divisors (see below), whose sum is σ = 107596800. Its totient is φ = 48299544.

The previous prime is 72538517. The next prime is 72538559. The reversal of 72538551 is 15583527.

72538551 is a `hidden beast` number, since 72 + 5 + 38 + 551 = 666.

It is not a de Polignac number, because 72538551 - 2¹⁷ = 72407479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72538559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37920 + ... + 39786.

It is an arithmetic number, because the mean of its divisors is an integer number (6724800).

Almost surely, 2^72538551 is an apocalyptic number.

72538551 is a deficient number, since it is larger than the sum of its proper divisors (35058249).

72538551 is a wasteful number, since it uses less digits than its factorization.

72538551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3315 (or 3309 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 72538551 is about 8516.9566747753. The cubic root of 72538551 is about 417.0514402667.

The spelling of 72538551 in words is "seventy-two million, five hundred thirty-eight thousand, five hundred fifty-one".