28778919000 has 128 divisors (see below), whose sum is σ = 96697298880. Its totient is φ = 7084032000.

The previous prime is 28778918969. The next prime is 28778919007. The reversal of 28778919000 is 91987782.

It is a super-2 number, since 2×28778919000² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778919007) 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 31 ways as a sum of consecutive naturals, for example, 329961 + ... + 407960.

Almost surely, 2^28778919000 is an apocalyptic number.

28778919000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28778919000 is an abundant number, since it is smaller than the sum of its proper divisors (67918379880).

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

28778919000 is a wasteful number, since it uses less digits than its factorization.

28778919000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737958 (or 737944 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 51.

The spelling of 28778919000 in words is "twenty-eight billion, seven hundred seventy-eight million, nine hundred nineteen thousand".