28618769 has 16 divisors (see below), whose sum is σ = 32114880. Its totient is φ = 25344000.

The previous prime is 28618757. The next prime is 28618771. The reversal of 28618769 is 96781682.

It is a cyclic number.

It is not a de Polignac number, because 28618769 - 2⁴ = 28618753 is a prime.

It is a super-2 number, since 2×28618769² = 1638067878150722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28618729) 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, 80897 + ... + 81249.

It is an arithmetic number, because the mean of its divisors is an integer number (2007180).

Almost surely, 2^28618769 is an apocalyptic number.

It is an amenable number.

28618769 is a deficient number, since it is larger than the sum of its proper divisors (3496111).

28618769 is a wasteful number, since it uses less digits than its factorization.

28618769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640.

The product of its digits is 290304, while the sum is 47.

The square root of 28618769 is about 5349.6512970473. The cubic root of 28618769 is about 305.8794611174.

The spelling of 28618769 in words is "twenty-eight million, six hundred eighteen thousand, seven hundred sixty-nine".