28178537738923 has 16 divisors (see below), whose sum is σ = 33108059821536. Its totient is φ = 23644036592640.

The previous prime is 28178537738921. The next prime is 28178537738959. The reversal of 28178537738923 is 32983773587182.

It is a cyclic number.

It is not a de Polignac number, because 28178537738923 - 2¹ = 28178537738921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28178537738921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8053236 + ... + 11009617.

It is an arithmetic number, because the mean of its divisors is an integer number (2069253738846).

Almost surely, 2^{28178537738923} is an apocalyptic number.

28178537738923 is a deficient number, since it is larger than the sum of its proper divisors (4929522082613).

28178537738923 is a wasteful number, since it uses less digits than its factorization.

28178537738923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19073214.

The product of its digits is 853493760, while the sum is 73.

The spelling of 28178537738923 in words is "twenty-eight trillion, one hundred seventy-eight billion, five hundred thirty-seven million, seven hundred thirty-eight thousand, nine hundred twenty-three".