72752866 has 4 divisors (see below), whose sum is σ = 109129302. Its totient is φ = 36376432.

The previous prime is 72752837. The next prime is 72752873. The reversal of 72752866 is 66825727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66825727 = 4723 ⋅14149.

It can be written as a sum of positive squares in only one way, i.e., 72743841 + 9025 = 8529^2 + 95^2 .

It is a super-2 number, since 2×72752866² = 10585959022427912, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18188215 + ... + 18188218.

Almost surely, 2^72752866 is an apocalyptic number.

72752866 is a deficient number, since it is larger than the sum of its proper divisors (36376436).

72752866 is a wasteful number, since it uses less digits than its factorization.

72752866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36376435.

The product of its digits is 282240, while the sum is 43.

The square root of 72752866 is about 8529.5290608568. The cubic root of 72752866 is about 417.4617623077.

The spelling of 72752866 in words is "seventy-two million, seven hundred fifty-two thousand, eight hundred sixty-six".