72472261 has 4 divisors (see below), whose sum is σ = 74014272. Its totient is φ = 70930252.

The previous prime is 72472229. The next prime is 72472271. The reversal of 72472261 is 16227427.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16227427 = 631 ⋅25717.

It is a cyclic number.

It is not a de Polignac number, because 72472261 - 2⁵ = 72472229 is a prime.

It is a super-2 number, since 2×72472261² = 10504457228904242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72472271) 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 3 ways as a sum of consecutive naturals, for example, 770935 + ... + 771028.

It is an arithmetic number, because the mean of its divisors is an integer number (18503568).

Almost surely, 2^72472261 is an apocalyptic number.

It is an amenable number.

72472261 is a deficient number, since it is larger than the sum of its proper divisors (1542011).

72472261 is a wasteful number, since it uses less digits than its factorization.

72472261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542010.

The product of its digits is 9408, while the sum is 31.

The square root of 72472261 is about 8513.0641369603. The cubic root of 72472261 is about 416.9243594915.

Adding to 72472261 its reverse (16227427), we get a palindrome (88699688).

The spelling of 72472261 in words is "seventy-two million, four hundred seventy-two thousand, two hundred sixty-one".