28730702440 has 128 divisors (see below), whose sum is σ = 76491112320. Its totient is φ = 9593036800.

The previous prime is 28730702419. The next prime is 28730702459. The reversal of 28730702440 is 4420703782.

It is a self number, because there is not a number n which added to its sum of digits gives 28730702440.

It is an unprimeable number.

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, 259839 + ... + 353521.

It is an arithmetic number, because the mean of its divisors is an integer number (597586815).

Almost surely, 2^28730702440 is an apocalyptic number.

28730702440 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 28730702440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38245556160).

28730702440 is an abundant number, since it is smaller than the sum of its proper divisors (47760409880).

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

28730702440 is a wasteful number, since it uses less digits than its factorization.

28730702440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93763 (or 93759 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 37.

The spelling of 28730702440 in words is "twenty-eight billion, seven hundred thirty million, seven hundred two thousand, four hundred forty".