28992769 has 12 divisors (see below), whose sum is σ = 33171964. Its totient is φ = 25185024.

The previous prime is 28992767. The next prime is 28992787. The reversal of 28992769 is 96729982.

It can be written as a sum of positive squares in 6 ways, for example, as 263169 + 28729600 = 513^2 + 5360^2 .

It is not a de Polignac number, because 28992769 - 2¹ = 28992767 is a prime.

It is a super-2 number, since 2×28992769² = 1681161308574722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28992767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102 + ... + 7615.

Almost surely, 2^28992769 is an apocalyptic number.

It is an amenable number.

28992769 is a deficient number, since it is larger than the sum of its proper divisors (4179195).

28992769 is a wasteful number, since it uses less digits than its factorization.

28992769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7764 (or 7747 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 28992769 is about 5384.4933837827. The cubic root of 28992769 is about 307.2061449023.

The spelling of 28992769 in words is "twenty-eight million, nine hundred ninety-two thousand, seven hundred sixty-nine".