72871865 has 16 divisors (see below), whose sum is σ = 96474240. Its totient is φ = 52398720.

The previous prime is 72871861. The next prime is 72871871. The reversal of 72871865 is 56817827.

It is not a de Polignac number, because 72871865 - 2² = 72871861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72871861) 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, 2549 + ... + 12338.

It is an arithmetic number, because the mean of its divisors is an integer number (6029640).

Almost surely, 2^72871865 is an apocalyptic number.

It is an amenable number.

72871865 is a deficient number, since it is larger than the sum of its proper divisors (23602375).

72871865 is a wasteful number, since it uses less digits than its factorization.

72871865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14992.

The product of its digits is 188160, while the sum is 44.

The square root of 72871865 is about 8536.5019182333. The cubic root of 72871865 is about 417.6892469159.

The spelling of 72871865 in words is "seventy-two million, eight hundred seventy-one thousand, eight hundred sixty-five".