72563281 has 8 divisors (see below), whose sum is σ = 85604864. Its totient is φ = 60190560.

The previous prime is 72563279. The next prime is 72563291. The reversal of 72563281 is 18236527.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72563281 - 2¹ = 72563279 is a prime.

It is a super-2 number, since 2×72563281² = 10530859498969922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72563291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166980 + ... + 167413.

It is an arithmetic number, because the mean of its divisors is an integer number (10700608).

Almost surely, 2^72563281 is an apocalyptic number.

It is an amenable number.

72563281 is a deficient number, since it is larger than the sum of its proper divisors (13041583).

72563281 is a wasteful number, since it uses less digits than its factorization.

72563281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334431.

The product of its digits is 20160, while the sum is 34.

The square root of 72563281 is about 8518.4083607209. The cubic root of 72563281 is about 417.0988289087.

The spelling of 72563281 in words is "seventy-two million, five hundred sixty-three thousand, two hundred eighty-one".