72145761 has 8 divisors (see below), whose sum is σ = 96929184. Its totient is φ = 47729760.

The previous prime is 72145757. The next prime is 72145781. The reversal of 72145761 is 16754127.

72145761 is nontrivially palindromic in base 14.

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

It is not a de Polignac number, because 72145761 - 2² = 72145757 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72145721) 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 7 ways as a sum of consecutive naturals, for example, 91396 + ... + 92181.

It is an arithmetic number, because the mean of its divisors is an integer number (12116148).

Almost surely, 2^72145761 is an apocalyptic number.

It is an amenable number.

72145761 is a deficient number, since it is larger than the sum of its proper divisors (24783423).

72145761 is a wasteful number, since it uses less digits than its factorization.

72145761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183711.

The product of its digits is 11760, while the sum is 33.

The square root of 72145761 is about 8493.8660808845. The cubic root of 72145761 is about 416.2973115789.

Adding to 72145761 its reverse (16754127), we get a palindrome (88899888).

The spelling of 72145761 in words is "seventy-two million, one hundred forty-five thousand, seven hundred sixty-one".