72727551 has 20 divisors (see below), whose sum is σ = 117001192. Its totient is φ = 44754768.

The previous prime is 72727549. The next prime is 72727553. The reversal of 72727551 is 15572727.

It is an interprime number because it is at equal distance from previous prime (72727549) and next prime (72727553).

It is not a de Polignac number, because 72727551 - 2¹ = 72727549 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72727553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33481 + ... + 35586.

Almost surely, 2^72727551 is an apocalyptic number.

72727551 is a deficient number, since it is larger than the sum of its proper divisors (44273641).

72727551 is a wasteful number, since it uses less digits than its factorization.

72727551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69092 (or 69083 counting only the distinct ones).

The product of its digits is 34300, while the sum is 36.

The square root of 72727551 is about 8528.0449693936. The cubic root of 72727551 is about 417.4133368592.

The spelling of 72727551 in words is "seventy-two million, seven hundred twenty-seven thousand, five hundred fifty-one".