72443728406 has 32 divisors (see below), whose sum is σ = 129624634368. Its totient is φ = 29689212960.

The previous prime is 72443728391. The next prime is 72443728433. The reversal of 72443728406 is 60482734427.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1211471 + ... + 1269861.

It is an arithmetic number, because the mean of its divisors is an integer number (4050769824).

Almost surely, 2^72443728406 is an apocalyptic number.

72443728406 is a deficient number, since it is larger than the sum of its proper divisors (57180905962).

72443728406 is a wasteful number, since it uses less digits than its factorization.

72443728406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62276.

The product of its (nonzero) digits is 1806336, while the sum is 47.

The spelling of 72443728406 in words is "seventy-two billion, four hundred forty-three million, seven hundred twenty-eight thousand, four hundred six".