72421471 has 4 divisors (see below), whose sum is σ = 72439312. Its totient is φ = 72403632.

The previous prime is 72421441. The next prime is 72421477. The reversal of 72421471 is 17412427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72421471 - 2¹⁹ = 71897183 is a prime.

It is a super-3 number, since 3×72421471³ (a number of 25 digits) contains 333 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 (72421477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451 + ... + 12043.

It is an arithmetic number, because the mean of its divisors is an integer number (18109828).

Almost surely, 2^72421471 is an apocalyptic number.

72421471 is a deficient number, since it is larger than the sum of its proper divisors (17841).

72421471 is a wasteful number, since it uses less digits than its factorization.

72421471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17840.

The product of its digits is 3136, while the sum is 28.

The square root of 72421471 is about 8510.0805519102. The cubic root of 72421471 is about 416.8269404394.

Adding to 72421471 its reverse (17412427), we get a palindrome (89833898).

The spelling of 72421471 in words is "seventy-two million, four hundred twenty-one thousand, four hundred seventy-one".