28378019691126 has 64 divisors (see below), whose sum is σ = 72078265190400. Its totient is φ = 8107206418368.

The previous prime is 28378019691107. The next prime is 28378019691169. The reversal of 28378019691126 is 62119691087382.

28378019691126 is a `hidden beast` number, since 283 + 7 + 80 + 196 + 91 + 1 + 2 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145146 + ... + 7535058.

It is an arithmetic number, because the mean of its divisors is an integer number (1126222893600).

Almost surely, 2^{28378019691126} is an apocalyptic number.

28378019691126 is an abundant number, since it is smaller than the sum of its proper divisors (43700245499274).

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

28378019691126 is a wasteful number, since it uses less digits than its factorization.

28378019691126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7400090 (or 7400084 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 28378019691126 in words is "twenty-eight trillion, three hundred seventy-eight billion, nineteen million, six hundred ninety-one thousand, one hundred twenty-six".