72891559 has 6 divisors (see below), whose sum is σ = 78930096. Its totient is φ = 67284360.

The previous prime is 72891557. The next prime is 72891601. The reversal of 72891559 is 95519827.

It is not a de Polignac number, because 72891559 - 2¹ = 72891557 is a prime.

It is a super-3 number, since 3×72891559³ (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 (72891557) 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 5 ways as a sum of consecutive naturals, for example, 215487 + ... + 215824.

It is an arithmetic number, because the mean of its divisors is an integer number (13155016).

Almost surely, 2^72891559 is an apocalyptic number.

72891559 is a deficient number, since it is larger than the sum of its proper divisors (6038537).

72891559 is a wasteful number, since it uses less digits than its factorization.

72891559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431337 (or 431324 counting only the distinct ones).

The product of its digits is 226800, while the sum is 46.

The square root of 72891559 is about 8537.6553572980. The cubic root of 72891559 is about 417.7268710895.

The spelling of 72891559 in words is "seventy-two million, eight hundred ninety-one thousand, five hundred fifty-nine".