28645428 has 24 divisors (see below), whose sum is σ = 76388032. Its totient is φ = 8184384.

The previous prime is 28645427. The next prime is 28645469. The reversal of 28645428 is 82454682.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170425 + ... + 170592.

Almost surely, 2^28645428 is an apocalyptic number.

28645428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28645428 is an abundant number, since it is smaller than the sum of its proper divisors (47742604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28645428 is a wasteful number, since it uses less digits than its factorization.

28645428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341031 (or 341029 counting only the distinct ones).

The product of its digits is 122880, while the sum is 39.

The square root of 28645428 is about 5352.1423747879. The cubic root of 28645428 is about 305.9744094110.

The spelling of 28645428 in words is "twenty-eight million, six hundred forty-five thousand, four hundred twenty-eight".