28638801285 has 16 divisors (see below), whose sum is σ = 45889187904. Its totient is φ = 15251658752.

The previous prime is 28638801283. The next prime is 28638801313. The reversal of 28638801285 is 58210883682.

It is a cyclic number.

It is not a de Polignac number, because 28638801285 - 2¹ = 28638801283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28638801281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1387452 + ... + 1407941.

It is an arithmetic number, because the mean of its divisors is an integer number (2868074244).

Almost surely, 2^28638801285 is an apocalyptic number.

It is an amenable number.

28638801285 is a deficient number, since it is larger than the sum of its proper divisors (17250386619).

28638801285 is a wasteful number, since it uses less digits than its factorization.

28638801285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2796084.

The product of its (nonzero) digits is 1474560, while the sum is 51.

The spelling of 28638801285 in words is "twenty-eight billion, six hundred thirty-eight million, eight hundred one thousand, two hundred eighty-five".