72021589 has 4 divisors (see below), whose sum is σ = 72453024. Its totient is φ = 71590156.

The previous prime is 72021577. The next prime is 72021601. The reversal of 72021589 is 98512027.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98512027 = 8389 ⋅11743.

It is an interprime number because it is at equal distance from previous prime (72021577) and next prime (72021601).

It is a cyclic number.

It is not a de Polignac number, because 72021589 - 2⁵ = 72021557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72021539) 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, 215467 + ... + 215800.

It is an arithmetic number, because the mean of its divisors is an integer number (18113256).

Almost surely, 2^72021589 is an apocalyptic number.

It is an amenable number.

72021589 is a deficient number, since it is larger than the sum of its proper divisors (431435).

72021589 is a wasteful number, since it uses less digits than its factorization.

72021589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431434.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 72021589 is about 8486.5534229156. The cubic root of 72021589 is about 416.0583409456.

The spelling of 72021589 in words is "seventy-two million, twenty-one thousand, five hundred eighty-nine".