28381156038378 has 96 divisors (see below), whose sum is σ = 72882261466560. Its totient is φ = 7868530091520.

The previous prime is 28381156038343. The next prime is 28381156038383. The reversal of 28381156038378 is 87383065118382.

28381156038378 is a `hidden beast` number, since 2 + 8 + 3 + 8 + 1 + 1 + 560 + 38 + 37 + 8 = 666.

It is a super-2 number, since 2×28381156038378² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48497148 + ... + 49078871.

It is an arithmetic number, because the mean of its divisors is an integer number (759190223610).

Almost surely, 2^{28381156038378} is an apocalyptic number.

28381156038378 is an abundant number, since it is smaller than the sum of its proper divisors (44501105428182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28381156038378 is a wasteful number, since it uses less digits than its factorization.

28381156038378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97576164 (or 97576161 counting only the distinct ones).

The product of its (nonzero) digits is 46448640, while the sum is 63.

The spelling of 28381156038378 in words is "twenty-eight trillion, three hundred eighty-one billion, one hundred fifty-six million, thirty-eight thousand, three hundred seventy-eight".