28993425 has 24 divisors (see below), whose sum is σ = 48208224. Its totient is φ = 15375360.

The previous prime is 28993421. The next prime is 28993429. The reversal of 28993425 is 52439982.

It is an interprime number because it is at equal distance from previous prime (28993421) and next prime (28993429).

It is not a de Polignac number, because 28993425 - 2² = 28993421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28993421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13474 + ... + 15476.

It is an arithmetic number, because the mean of its divisors is an integer number (2008676).

Almost surely, 2^28993425 is an apocalyptic number.

28993425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28993425 is a deficient number, since it is larger than the sum of its proper divisors (19214799).

28993425 is a wasteful number, since it uses less digits than its factorization.

28993425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209 (or 2204 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 28993425 is about 5384.5542991041. The cubic root of 28993425 is about 307.2084618675.

The spelling of 28993425 in words is "twenty-eight million, nine hundred ninety-three thousand, four hundred twenty-five".