72028591 has 4 divisors (see below), whose sum is σ = 72232992. Its totient is φ = 71824192.

The previous prime is 72028543. The next prime is 72028633. The reversal of 72028591 is 19582027.

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 72028591 - 2¹⁵ = 71995823 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 (72028511) 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, 101671 + ... + 102376.

It is an arithmetic number, because the mean of its divisors is an integer number (18058248).

Almost surely, 2^72028591 is an apocalyptic number.

72028591 is a deficient number, since it is larger than the sum of its proper divisors (204401).

72028591 is a wasteful number, since it uses less digits than its factorization.

72028591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204400.

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

The square root of 72028591 is about 8486.9659478520. The cubic root of 72028591 is about 416.0718236903.

Subtracting from 72028591 its reverse (19582027), we obtain a square (52446564 = 7242²).

The spelling of 72028591 in words is "seventy-two million, twenty-eight thousand, five hundred ninety-one".