72288781 has 8 divisors (see below), whose sum is σ = 74640384. Its totient is φ = 69965280.

The previous prime is 72288763. The next prime is 72288803. The reversal of 72288781 is 18788227.

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 72288781 - 2¹⁹ = 71764493 is a prime.

It is a super-2 number, since 2×72288781² = 10451335716931922, which contains 22 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 (72288581) 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 7 ways as a sum of consecutive naturals, for example, 1735 + ... + 12148.

It is an arithmetic number, because the mean of its divisors is an integer number (9330048).

Almost surely, 2^72288781 is an apocalyptic number.

It is an amenable number.

72288781 is a deficient number, since it is larger than the sum of its proper divisors (2351603).

72288781 is a wasteful number, since it uses less digits than its factorization.

72288781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14051.

The product of its digits is 100352, while the sum is 43.

The square root of 72288781 is about 8502.2809292566. The cubic root of 72288781 is about 416.5722158891.

The spelling of 72288781 in words is "seventy-two million, two hundred eighty-eight thousand, seven hundred eighty-one".