28788240385 has 8 divisors (see below), whose sum is σ = 36577999656. Its totient is φ = 21675851520.

The previous prime is 28788240359. The next prime is 28788240401. The reversal of 28788240385 is 58304288782.

It can be written as a sum of positive squares in 4 ways, for example, as 1022016961 + 27766223424 = 31969^2 + 166632^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28788240385 - 2⁵ = 28788240353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169342506 + ... + 169342675.

It is an arithmetic number, because the mean of its divisors is an integer number (4572249957).

Almost surely, 2^28788240385 is an apocalyptic number.

It is an amenable number.

28788240385 is a deficient number, since it is larger than the sum of its proper divisors (7789759271).

28788240385 is a wasteful number, since it uses less digits than its factorization.

28788240385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338685203.

The product of its (nonzero) digits is 6881280, while the sum is 55.

The spelling of 28788240385 in words is "twenty-eight billion, seven hundred eighty-eight million, two hundred forty thousand, three hundred eighty-five".