28429681 has 16 divisors (see below), whose sum is σ = 34790400. Its totient is φ = 22688208.

The previous prime is 28429673. The next prime is 28429691. The reversal of 28429681 is 18692482.

It is a cyclic number.

It is not a de Polignac number, because 28429681 - 2³ = 28429673 is a prime.

It is a super-2 number, since 2×28429681² = 1616493523523522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28429691) 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, 6036 + ... + 9658.

It is an arithmetic number, because the mean of its divisors is an integer number (2174400).

Almost surely, 2^28429681 is an apocalyptic number.

It is an amenable number.

28429681 is a deficient number, since it is larger than the sum of its proper divisors (6360719).

28429681 is a wasteful number, since it uses less digits than its factorization.

28429681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3708.

The product of its digits is 55296, while the sum is 40.

The square root of 28429681 is about 5331.9490807771. The cubic root of 28429681 is about 305.2043099419.

The spelling of 28429681 in words is "twenty-eight million, four hundred twenty-nine thousand, six hundred eighty-one".