28645429 has 4 divisors (see below), whose sum is σ = 29344140. Its totient is φ = 27946720.

The previous prime is 28645427. The next prime is 28645469. The reversal of 28645429 is 92454682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92454682 = 2 ⋅46227341.

It can be written as a sum of positive squares in 2 ways, for example, as 16184529 + 12460900 = 4023^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 28645429 - 2¹ = 28645427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28645391 and 28645400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349294 + ... + 349375.

It is an arithmetic number, because the mean of its divisors is an integer number (7336035).

Almost surely, 2^28645429 is an apocalyptic number.

It is an amenable number.

28645429 is a deficient number, since it is larger than the sum of its proper divisors (698711).

28645429 is an equidigital number, since it uses as much as digits as its factorization.

28645429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698710.

The product of its digits is 138240, while the sum is 40.

The square root of 28645429 is about 5352.1424682084. The cubic root of 28645429 is about 305.9744129715.

The spelling of 28645429 in words is "twenty-eight million, six hundred forty-five thousand, four hundred twenty-nine".