28131760778 has 32 divisors (see below), whose sum is σ = 46770910272. Its totient is φ = 12583209600.

The previous prime is 28131760777. The next prime is 28131760799. The reversal of 28131760778 is 87706713182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28131760777) 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, 691688 + ... + 731228.

It is an arithmetic number, because the mean of its divisors is an integer number (1461590946).

Almost surely, 2^28131760778 is an apocalyptic number.

28131760778 is a deficient number, since it is larger than the sum of its proper divisors (18639149494).

28131760778 is a wasteful number, since it uses less digits than its factorization.

28131760778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40070.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 28131760778 in words is "twenty-eight billion, one hundred thirty-one million, seven hundred sixty thousand, seven hundred seventy-eight".