28321425 has 36 divisors (see below), whose sum is σ = 55343184. Its totient is φ = 13730400.

The previous prime is 28321417. The next prime is 28321459. The reversal of 28321425 is 52412382.

It is not a de Polignac number, because 28321425 - 2³ = 28321417 is a prime.

It is a super-2 number, since 2×28321425² = 1604206228061250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3247 + ... + 8196.

Almost surely, 2^28321425 is an apocalyptic number.

28321425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28321425 is a deficient number, since it is larger than the sum of its proper divisors (27021759).

28321425 is a wasteful number, since it uses less digits than its factorization.

28321425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11470 (or 11462 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 28321425 is about 5321.7877635246. The cubic root of 28321425 is about 304.8164263059.

The spelling of 28321425 in words is "twenty-eight million, three hundred twenty-one thousand, four hundred twenty-five".