72247551 has 8 divisors (see below), whose sum is σ = 96432000. Its totient is φ = 48114072.

The previous prime is 72247543. The next prime is 72247559. The reversal of 72247551 is 15574227.

It is an interprime number because it is at equal distance from previous prime (72247543) and next prime (72247559).

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

It is not a de Polignac number, because 72247551 - 2³ = 72247543 is a prime.

It is a super-3 number, since 3×72247551³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72247559) 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, 9301 + ... + 15198.

It is an arithmetic number, because the mean of its divisors is an integer number (12054000).

Almost surely, 2^72247551 is an apocalyptic number.

72247551 is a deficient number, since it is larger than the sum of its proper divisors (24184449).

72247551 is a wasteful number, since it uses less digits than its factorization.

72247551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25485.

The product of its digits is 19600, while the sum is 33.

The square root of 72247551 is about 8499.8559399557. The cubic root of 72247551 is about 416.4930033263.

The spelling of 72247551 in words is "seventy-two million, two hundred forty-seven thousand, five hundred fifty-one".