28317731378 has 8 divisors (see below), whose sum is σ = 42897157740. Its totient is φ = 14018678800.

The previous prime is 28317731371. The next prime is 28317731389. The reversal of 28317731378 is 87313771382.

It can be written as a sum of positive squares in 2 ways, for example, as 25121299009 + 3196432369 = 158497^2 + 56537^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×28317731378³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28317731371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70093193 + ... + 70093596.

Almost surely, 2^28317731378 is an apocalyptic number.

28317731378 is a deficient number, since it is larger than the sum of its proper divisors (14579426362).

28317731378 is a wasteful number, since it uses less digits than its factorization.

28317731378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140186892.

The product of its digits is 1185408, while the sum is 50.

The spelling of 28317731378 in words is "twenty-eight billion, three hundred seventeen million, seven hundred thirty-one thousand, three hundred seventy-eight".