72648403 has 4 divisors (see below), whose sum is σ = 73054440. Its totient is φ = 72242368.

The previous prime is 72648397. The next prime is 72648413. The reversal of 72648403 is 30484627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30484627 = 3251 ⋅9377.

It is a cyclic number.

It is not a de Polignac number, because 72648403 - 2⁹ = 72647891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72648413) 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, 202750 + ... + 203107.

It is an arithmetic number, because the mean of its divisors is an integer number (18263610).

Almost surely, 2^72648403 is an apocalyptic number.

72648403 is a deficient number, since it is larger than the sum of its proper divisors (406037).

72648403 is a wasteful number, since it uses less digits than its factorization.

72648403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406036.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 72648403 is about 8523.4032522227. The cubic root of 72648403 is about 417.2618609181.

The spelling of 72648403 in words is "seventy-two million, six hundred forty-eight thousand, four hundred three".