72660081 has 16 divisors (see below), whose sum is σ = 105413504. Its totient is φ = 44250624.

The previous prime is 72660043. The next prime is 72660113. The reversal of 72660081 is 18006627.

It is a happy number.

It is not a de Polignac number, because 72660081 - 2⁷ = 72659953 is a prime.

It is a super-2 number, since 2×72660081² = 10558974741853122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72660031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5821 + ... + 13386.

It is an arithmetic number, because the mean of its divisors is an integer number (6588344).

Almost surely, 2^72660081 is an apocalyptic number.

It is an amenable number.

72660081 is a deficient number, since it is larger than the sum of its proper divisors (32753423).

72660081 is a wasteful number, since it uses less digits than its factorization.

72660081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19320.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 72660081 is about 8524.0882796930. The cubic root of 72660081 is about 417.2842175597.

The spelling of 72660081 in words is "seventy-two million, six hundred sixty thousand, eighty-one".