72281878405 has 16 divisors (see below), whose sum is σ = 94909445568. Its totient is φ = 52409808000.

The previous prime is 72281878399. The next prime is 72281878439. The reversal of 72281878405 is 50487818227.

It is not a de Polignac number, because 72281878405 - 2¹¹ = 72281876357 is a prime.

It is a Duffinian 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 in 15 ways as a sum of consecutive naturals, for example, 1967016 + ... + 2003425.

It is an arithmetic number, because the mean of its divisors is an integer number (5931840348).

Almost surely, 2^72281878405 is an apocalyptic number.

It is an amenable number.

72281878405 is a deficient number, since it is larger than the sum of its proper divisors (22627567163).

72281878405 is a wasteful number, since it uses less digits than its factorization.

72281878405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970788.

The product of its (nonzero) digits is 2007040, while the sum is 52.

The spelling of 72281878405 in words is "seventy-two billion, two hundred eighty-one million, eight hundred seventy-eight thousand, four hundred five".