72095921 has 8 divisors (see below), whose sum is σ = 73465704. Its totient is φ = 70739200.

The previous prime is 72095911. The next prime is 72095941. The reversal of 72095921 is 12959027.

It can be written as a sum of positive squares in 4 ways, for example, as 9859600 + 62236321 = 3140^2 + 7889^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 72095921 - 2¹⁸ = 71833777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72095911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8255 + ... + 14571.

It is an arithmetic number, because the mean of its divisors is an integer number (9183213).

Almost surely, 2^72095921 is an apocalyptic number.

It is an amenable number.

72095921 is a deficient number, since it is larger than the sum of its proper divisors (1369783).

72095921 is a wasteful number, since it uses less digits than its factorization.

72095921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6531.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 72095921 is about 8490.9316921054. The cubic root of 72095921 is about 416.2014268156.

The spelling of 72095921 in words is "seventy-two million, ninety-five thousand, nine hundred twenty-one".