72489487 has 4 divisors (see below), whose sum is σ = 82845136. Its totient is φ = 62133840.

The previous prime is 72489481. The next prime is 72489551. The reversal of 72489487 is 78498427.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78498427 = 7 ⋅11214061.

It is a cyclic number.

It is not a de Polignac number, because 72489487 - 2⁷ = 72489359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72489487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72489481) 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, 5177814 + ... + 5177827.

It is an arithmetic number, because the mean of its divisors is an integer number (20711284).

Almost surely, 2^72489487 is an apocalyptic number.

72489487 is a deficient number, since it is larger than the sum of its proper divisors (10355649).

72489487 is a wasteful number, since it uses less digits than its factorization.

72489487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10355648.

The product of its digits is 903168, while the sum is 49.

The square root of 72489487 is about 8514.0758159650. The cubic root of 72489487 is about 416.9573899226.

The spelling of 72489487 in words is "seventy-two million, four hundred eighty-nine thousand, four hundred eighty-seven".