28788490640 has 160 divisors (see below), whose sum is σ = 82526551296. Its totient is φ = 9094809600.

The previous prime is 28788490589. The next prime is 28788490663. The reversal of 28788490640 is 4609488782.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4459415 + ... + 4465865.

Almost surely, 2^28788490640 is an apocalyptic number.

28788490640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28788490640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41263275648).

28788490640 is an abundant number, since it is smaller than the sum of its proper divisors (53738060656).

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

28788490640 is a wasteful number, since it uses less digits than its factorization.

28788490640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7097 (or 7091 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 56.

The spelling of 28788490640 in words is "twenty-eight billion, seven hundred eighty-eight million, four hundred ninety thousand, six hundred forty".