28938425 has 12 divisors (see below), whose sum is σ = 37772880. Its totient is φ = 21931920.

The previous prime is 28938421. The next prime is 28938431. The reversal of 28938425 is 52483982.

It is not a de Polignac number, because 28938425 - 2² = 28938421 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28938421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29987 + ... + 30936.

It is an arithmetic number, because the mean of its divisors is an integer number (3147740).

Almost surely, 2^28938425 is an apocalyptic number.

28938425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28938425 is a deficient number, since it is larger than the sum of its proper divisors (8834455).

28938425 is a wasteful number, since it uses less digits than its factorization.

28938425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60952 (or 60947 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 28938425 is about 5379.4446739417. Note that the first 3 decimals coincide. The cubic root of 28938425 is about 307.0140826157.

The spelling of 28938425 in words is "twenty-eight million, nine hundred thirty-eight thousand, four hundred twenty-five".