28867029409 has 9 divisors (see below), whose sum is σ = 29291574259. Its totient is φ = 28448558320.

The previous prime is 28867029397. The next prime is 28867029419. The reversal of 28867029409 is 90492076882.

The square root of 28867029409 is 169903.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 600005025 + 28267024384 = 24495^2 + 168128^2 .

It is not a de Polignac number, because 28867029409 - 2²³ = 28858640801 is a prime.

It is a super-3 number, since 3×28867029409³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28867029409.

It is not an unprimeable number, because it can be changed into a prime (28867029419) by changing a digit.

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 8 ways as a sum of consecutive naturals, for example, 12061917 + ... + 12064309.

Almost surely, 2^28867029409 is an apocalyptic number.

28867029409 is the 169903-rd square number.

28867029409 is the 84952-nd centered octagonal number.

It is an amenable number.

28867029409 is a deficient number, since it is larger than the sum of its proper divisors (424544850).

28867029409 is an frugal number, since it uses more digits than its factorization.

28867029409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928 (or 2464 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 55.

The spelling of 28867029409 in words is "twenty-eight billion, eight hundred sixty-seven million, twenty-nine thousand, four hundred nine".