28878055137 has 6 divisors (see below), whose sum is σ = 41712746322. Its totient is φ = 19252036752.

The previous prime is 28878055127. The next prime is 28878055163. The reversal of 28878055137 is 73155087882.

28878055137 is a `hidden beast` number, since 2 + 8 + 8 + 7 + 80 + 551 + 3 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16064041536 + 12814013601 = 126744^2 + 113199^2 .

It is not a de Polignac number, because 28878055137 - 2⁷ = 28878055009 is a prime.

It is a super-2 number, since 2×28878055137² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28878055127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1604336388 + ... + 1604336405.

It is an arithmetic number, because the mean of its divisors is an integer number (6952124387).

Almost surely, 2^28878055137 is an apocalyptic number.

It is an amenable number.

28878055137 is a deficient number, since it is larger than the sum of its proper divisors (12834691185).

28878055137 is a wasteful number, since it uses less digits than its factorization.

28878055137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3208672799 (or 3208672796 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 54.

The spelling of 28878055137 in words is "twenty-eight billion, eight hundred seventy-eight million, fifty-five thousand, one hundred thirty-seven".