28378388828820 has 96 divisors (see below), whose sum is σ = 82415033640576. Its totient is φ = 7290139968000.

The previous prime is 28378388828809. The next prime is 28378388828831. The reversal of 28378388828820 is 2882888387382.

It is an interprime number because it is at equal distance from previous prime (28378388828809) and next prime (28378388828831).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63058246 + ... + 63506685.

It is an arithmetic number, because the mean of its divisors is an integer number (858489933756).

Almost surely, 2^{28378388828820} is an apocalyptic number.

28378388828820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28378388828820 is an abundant number, since it is smaller than the sum of its proper divisors (54036644811756).

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

28378388828820 is a wasteful number, since it uses less digits than its factorization.

28378388828820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126565081 (or 126565079 counting only the distinct ones).

The product of its (nonzero) digits is 1056964608, while the sum is 75.

The spelling of 28378388828820 in words is "twenty-eight trillion, three hundred seventy-eight billion, three hundred eighty-eight million, eight hundred twenty-eight thousand, eight hundred twenty".