28778037900 has 36 divisors (see below), whose sum is σ = 83264457192. Its totient is φ = 7674143360.

The previous prime is 28778037889. The next prime is 28778037901. The reversal of 28778037900 is 973087782.

It is not an unprimeable number, because it can be changed into a prime (28778037901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47963097 + ... + 47963696.

Almost surely, 2^28778037900 is an apocalyptic number.

28778037900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28778037900 is an abundant number, since it is smaller than the sum of its proper divisors (54486419292).

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

28778037900 is a wasteful number, since it uses less digits than its factorization.

28778037900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95926810 (or 95926803 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 51.

The spelling of 28778037900 in words is "twenty-eight billion, seven hundred seventy-eight million, thirty-seven thousand, nine hundred".