72249641 has 4 divisors (see below), whose sum is σ = 74202372. Its totient is φ = 70296912.

The previous prime is 72249637. The next prime is 72249691. The reversal of 72249641 is 14694227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14694227 = 3761 ⋅3907.

It can be written as a sum of positive squares in 2 ways, for example, as 26822041 + 45427600 = 5179^2 + 6740^2 .

It is a cyclic number.

It is not a de Polignac number, because 72249641 - 2² = 72249637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72249691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 976310 + ... + 976383.

It is an arithmetic number, because the mean of its divisors is an integer number (18550593).

Almost surely, 2^72249641 is an apocalyptic number.

It is an amenable number.

72249641 is a deficient number, since it is larger than the sum of its proper divisors (1952731).

72249641 is a wasteful number, since it uses less digits than its factorization.

72249641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1952730.

The product of its digits is 24192, while the sum is 35.

The square root of 72249641 is about 8499.9788823267. The cubic root of 72249641 is about 416.4970194347.

The spelling of 72249641 in words is "seventy-two million, two hundred forty-nine thousand, six hundred forty-one".