72055784438 has 32 divisors (see below), whose sum is σ = 124042752000. Its totient is φ = 31087225120.

The previous prime is 72055784407. The next prime is 72055784441. The reversal of 72055784438 is 83448755027.

It is a self number, because there is not a number n which added to its sum of digits gives 72055784438.

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, 919478 + ... + 994761.

It is an arithmetic number, because the mean of its divisors is an integer number (3876336000).

Almost surely, 2^72055784438 is an apocalyptic number.

72055784438 is a deficient number, since it is larger than the sum of its proper divisors (51986967562).

72055784438 is a wasteful number, since it uses less digits than its factorization.

72055784438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1914340.

The product of its (nonzero) digits is 7526400, while the sum is 53.

The spelling of 72055784438 in words is "seventy-two billion, fifty-five million, seven hundred eighty-four thousand, four hundred thirty-eight".