72866071 has 4 divisors (see below), whose sum is σ = 72990792. Its totient is φ = 72741352.

The previous prime is 72866069. The next prime is 72866099. The reversal of 72866071 is 17066827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17066827 = 17 ⋅1003931.

It is a cyclic number.

It is not a de Polignac number, because 72866071 - 2¹ = 72866069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72866071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72866041) 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, 61480 + ... + 62653.

It is an arithmetic number, because the mean of its divisors is an integer number (18247698).

Almost surely, 2^72866071 is an apocalyptic number.

72866071 is a deficient number, since it is larger than the sum of its proper divisors (124721).

72866071 is a wasteful number, since it uses less digits than its factorization.

72866071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124720.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 72866071 is about 8536.1625453127. The cubic root of 72866071 is about 417.6781765454.

The spelling of 72866071 in words is "seventy-two million, eight hundred sixty-six thousand, seventy-one".