72335861 has 4 divisors (see below), whose sum is σ = 77900172. Its totient is φ = 66771552.

The previous prime is 72335819. The next prime is 72335881. The reversal of 72335861 is 16853327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16853327 = 1009 ⋅16703.

It can be written as a sum of positive squares in 2 ways, for example, as 33709636 + 38626225 = 5806^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 72335861 - 2¹⁸ = 72073717 is a prime.

It is a super-2 number, since 2×72335861² = 10464953573222642, 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 (72335881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2782136 + ... + 2782161.

It is an arithmetic number, because the mean of its divisors is an integer number (19475043).

Almost surely, 2^72335861 is an apocalyptic number.

It is an amenable number.

72335861 is a deficient number, since it is larger than the sum of its proper divisors (5564311).

72335861 is a wasteful number, since it uses less digits than its factorization.

72335861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564310.

The product of its digits is 30240, while the sum is 35.

The square root of 72335861 is about 8505.0491474183. The cubic root of 72335861 is about 416.6626308587.

The spelling of 72335861 in words is "seventy-two million, three hundred thirty-five thousand, eight hundred sixty-one".