72281861 has 8 divisors (see below), whose sum is σ = 73126944. Its totient is φ = 71442000.

The previous prime is 72281843. The next prime is 72281873. The reversal of 72281861 is 16818227.

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 72281861 - 2¹⁰ = 72280837 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 (72271861) 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, 30986 + ... + 33236.

It is an arithmetic number, because the mean of its divisors is an integer number (9140868).

Almost surely, 2^72281861 is an apocalyptic number.

It is an amenable number.

72281861 is a deficient number, since it is larger than the sum of its proper divisors (845083).

72281861 is a wasteful number, since it uses less digits than its factorization.

72281861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2611.

The product of its digits is 10752, while the sum is 35.

The square root of 72281861 is about 8501.8739698963. The cubic root of 72281861 is about 416.5589230393.

The spelling of 72281861 in words is "seventy-two million, two hundred eighty-one thousand, eight hundred sixty-one".