72421337 has 4 divisors (see below), whose sum is σ = 72789156. Its totient is φ = 72053520.

The previous prime is 72421333. The next prime is 72421357. The reversal of 72421337 is 73312427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73312427 = 31 ⋅2364917.

It can be written as a sum of positive squares in 2 ways, for example, as 58125376 + 14295961 = 7624^2 + 3781^2 .

It is a cyclic number.

It is not a de Polignac number, because 72421337 - 2² = 72421333 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72421333) 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, 183614 + ... + 184007.

It is an arithmetic number, because the mean of its divisors is an integer number (18197289).

Almost surely, 2^72421337 is an apocalyptic number.

It is an amenable number.

72421337 is a deficient number, since it is larger than the sum of its proper divisors (367819).

72421337 is a wasteful number, since it uses less digits than its factorization.

72421337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367818.

The product of its digits is 7056, while the sum is 29.

The square root of 72421337 is about 8510.0726788906. The cubic root of 72421337 is about 416.8266833571.

The spelling of 72421337 in words is "seventy-two million, four hundred twenty-one thousand, three hundred thirty-seven".