28431029 has 8 divisors (see below), whose sum is σ = 31128672. Its totient is φ = 25752240.

The previous prime is 28431019. The next prime is 28431031. The reversal of 28431029 is 92013482.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28431029 - 2¹² = 28426933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28430992 and 28431010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28431019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454 + ... + 7679.

It is an arithmetic number, because the mean of its divisors is an integer number (3891084).

Almost surely, 2^28431029 is an apocalyptic number.

It is an amenable number.

28431029 is a deficient number, since it is larger than the sum of its proper divisors (2697643).

28431029 is a wasteful number, since it uses less digits than its factorization.

28431029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9427.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 28431029 is about 5332.0754870876. The cubic root of 28431029 is about 305.2091336437.

It can be divided in two parts, 284 and 31029, that added together give a palindrome (31313).

The spelling of 28431029 in words is "twenty-eight million, four hundred thirty-one thousand, twenty-nine".