28659949780 has 96 divisors (see below), whose sum is σ = 76782182400. Its totient is φ = 8725207680.

The previous prime is 28659949777. The next prime is 28659949837. The reversal of 28659949780 is 8794995682.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150180 + ... + 282619.

It is an arithmetic number, because the mean of its divisors is an integer number (799814400).

Almost surely, 2^28659949780 is an apocalyptic number.

28659949780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28659949780 is an abundant number, since it is smaller than the sum of its proper divisors (48122232620).

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

28659949780 is a wasteful number, since it uses less digits than its factorization.

28659949780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432869 (or 432867 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 28659949780 in words is "twenty-eight billion, six hundred fifty-nine million, nine hundred forty-nine thousand, seven hundred eighty".