72865873 has 4 divisors (see below), whose sum is σ = 73014768. Its totient is φ = 72716980.

The previous prime is 72865867. The next prime is 72865879. The reversal of 72865873 is 37856827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (72865867) and next prime (72865879).

It is a cyclic number.

It is not a de Polignac number, because 72865873 - 2²¹ = 70768721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72865879) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 73711 + ... + 74692.

It is an arithmetic number, because the mean of its divisors is an integer number (18253692).

Almost surely, 2^72865873 is an apocalyptic number.

It is an amenable number.

72865873 is a deficient number, since it is larger than the sum of its proper divisors (148895).

72865873 is a wasteful number, since it uses less digits than its factorization.

72865873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148894.

The product of its digits is 564480, while the sum is 46.

The square root of 72865873 is about 8536.1509475876. The cubic root of 72865873 is about 417.6777982241.

The spelling of 72865873 in words is "seventy-two million, eight hundred sixty-five thousand, eight hundred seventy-three".