72648091 has 4 divisors (see below), whose sum is σ = 72843232. Its totient is φ = 72452952.

The previous prime is 72648083. The next prime is 72648109. The reversal of 72648091 is 19084627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19084627 = 107 ⋅178361.

It is a cyclic number.

It is not a de Polignac number, because 72648091 - 2³ = 72648083 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 72648091.

It is not an unprimeable number, because it can be changed into a prime (72648061) 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, 97011 + ... + 97756.

It is an arithmetic number, because the mean of its divisors is an integer number (18210808).

Almost surely, 2^72648091 is an apocalyptic number.

72648091 is a deficient number, since it is larger than the sum of its proper divisors (195141).

72648091 is a wasteful number, since it uses less digits than its factorization.

72648091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195140.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 72648091 is about 8523.3849496547. The cubic root of 72648091 is about 417.2612635850.

The spelling of 72648091 in words is "seventy-two million, six hundred forty-eight thousand, ninety-one".