28515425 has 12 divisors (see below), whose sum is σ = 35633136. Its totient is φ = 22635600.

The previous prime is 28515413. The next prime is 28515427. The reversal of 28515425 is 52451582.

It is not a de Polignac number, because 28515425 - 2¹⁴ = 28499041 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28515391 and 28515400.

It is not an unprimeable number, because it can be changed into a prime (28515427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1079 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (2969428).

Almost surely, 2^28515425 is an apocalyptic number.

28515425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28515425 is a deficient number, since it is larger than the sum of its proper divisors (7117711).

28515425 is a wasteful number, since it uses less digits than its factorization.

28515425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8848 (or 8843 counting only the distinct ones).

The product of its digits is 16000, while the sum is 32.

The square root of 28515425 is about 5339.9836142071. The cubic root of 28515425 is about 305.5108343487.

The spelling of 28515425 in words is "twenty-eight million, five hundred fifteen thousand, four hundred twenty-five".