72806420903 has 4 divisors (see below), whose sum is σ = 75971917488. Its totient is φ = 69640924320.

The previous prime is 72806420899. The next prime is 72806420909. The reversal of 72806420903 is 30902460827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30902460827 = 7 ⋅4414637261.

It is a cyclic number.

It is not a de Polignac number, because 72806420903 - 2² = 72806420899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72806420909) 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, 1582748258 + ... + 1582748303.

It is an arithmetic number, because the mean of its divisors is an integer number (18992979372).

Almost surely, 2^72806420903 is an apocalyptic number.

72806420903 is a deficient number, since it is larger than the sum of its proper divisors (3165496585).

72806420903 is a wasteful number, since it uses less digits than its factorization.

72806420903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165496584.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 72806420903 in words is "seventy-two billion, eight hundred six million, four hundred twenty thousand, nine hundred three".