72380420734 has 4 divisors (see below), whose sum is σ = 108570631104. Its totient is φ = 36190210366.

The previous prime is 72380420681. The next prime is 72380420759. The reversal of 72380420734 is 43702408327.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18095105182 + ... + 18095105185.

It is an arithmetic number, because the mean of its divisors is an integer number (27142657776).

Almost surely, 2^72380420734 is an apocalyptic number.

72380420734 is a deficient number, since it is larger than the sum of its proper divisors (36190210370).

72380420734 is a wasteful number, since it uses less digits than its factorization.

72380420734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36190210369.

The product of its (nonzero) digits is 225792, while the sum is 40.

The spelling of 72380420734 in words is "seventy-two billion, three hundred eighty million, four hundred twenty thousand, seven hundred thirty-four".