28857426 has 48 divisors (see below), whose sum is σ = 63244800. Its totient is φ = 8773440.

The previous prime is 28857421. The next prime is 28857443. The reversal of 28857426 is 62475882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857421) 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 23 ways as a sum of consecutive naturals, for example, 150991 + ... + 151181.

It is an arithmetic number, because the mean of its divisors is an integer number (1317600).

Almost surely, 2^28857426 is an apocalyptic number.

28857426 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28857426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31622400).

28857426 is an abundant number, since it is smaller than the sum of its proper divisors (34387374).

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

28857426 is a wasteful number, since it uses less digits than its factorization.

28857426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 358 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 28857426 is about 5371.9108332138. The cubic root of 28857426 is about 306.7273695734.

The spelling of 28857426 in words is "twenty-eight million, eight hundred fifty-seven thousand, four hundred twenty-six".