28653388985 has 8 divisors (see below), whose sum is σ = 37028995080. Its totient is φ = 21159425664.

The previous prime is 28653388963. The next prime is 28653388987. The reversal of 28653388985 is 58988335682.

It can be written as a sum of positive squares in 4 ways, for example, as 6119776441 + 22533612544 = 78229^2 + 150112^2 .

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

It is not a de Polignac number, because 28653388985 - 2¹⁶ = 28653323449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65), and also a Moran number because the ratio is a prime number: 440821369 = 28653388985 / (2 + 8 + 6 + 5 + 3 + 3 + 8 + 8 + 9 + 8 + 5).

It is not an unprimeable number, because it can be changed into a prime (28653388987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220410620 + ... + 220410749.

It is an arithmetic number, because the mean of its divisors is an integer number (4628624385).

Almost surely, 2^28653388985 is an apocalyptic number.

It is an amenable number.

28653388985 is a deficient number, since it is larger than the sum of its proper divisors (8375606095).

28653388985 is a wasteful number, since it uses less digits than its factorization.

28653388985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440821387.

The product of its digits is 99532800, while the sum is 65.

The spelling of 28653388985 in words is "twenty-eight billion, six hundred fifty-three million, three hundred eighty-eight thousand, nine hundred eighty-five".