28628840786 has 128 divisors (see below), whose sum is σ = 59076864000. Its totient is φ = 10069484544.

The previous prime is 28628840711. The next prime is 28628840789. The reversal of 28628840786 is 68704882682.

It is a super-2 number, since 2×28628840786² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28628840789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38739605 + ... + 38740343.

It is an arithmetic number, because the mean of its divisors is an integer number (461538000).

Almost surely, 2^28628840786 is an apocalyptic number.

28628840786 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28628840786 is an abundant number, since it is smaller than the sum of its proper divisors (30448023214).

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

28628840786 is a wasteful number, since it uses less digits than its factorization.

28628840786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456.

The product of its (nonzero) digits is 16515072, while the sum is 59.

The spelling of 28628840786 in words is "twenty-eight billion, six hundred twenty-eight million, eight hundred forty thousand, seven hundred eighty-six".