72150865 has 8 divisors (see below), whose sum is σ = 87438888. Its totient is φ = 57148800.

The previous prime is 72150853. The next prime is 72150877. The reversal of 72150865 is 56805127.

It is an interprime number because it is at equal distance from previous prime (72150853) and next prime (72150877).

It can be written as a sum of positive squares in 4 ways, for example, as 39237696 + 32913169 = 6264^2 + 5737^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72150865 - 2¹⁷ = 72019793 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 72150865.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70932 + ... + 71941.

It is an arithmetic number, because the mean of its divisors is an integer number (10929861).

Almost surely, 2^72150865 is an apocalyptic number.

It is an amenable number.

72150865 is a deficient number, since it is larger than the sum of its proper divisors (15288023).

72150865 is a wasteful number, since it uses less digits than its factorization.

72150865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142979.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 72150865 is about 8494.1665276824. The cubic root of 72150865 is about 416.3071284244.

The spelling of 72150865 in words is "seventy-two million, one hundred fifty thousand, eight hundred sixty-five".