28621425 has 24 divisors (see below), whose sum is σ = 54081856. Its totient is φ = 13083840.

The previous prime is 28621399. The next prime is 28621427. The reversal of 28621425 is 52412682.

It is not a de Polignac number, because 28621425 - 2⁵ = 28621393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28621392 and 28621401.

It is not an unprimeable number, because it can be changed into a prime (28621427) 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, 26734 + ... + 27783.

Almost surely, 2^28621425 is an apocalyptic number.

28621425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28621425 is a deficient number, since it is larger than the sum of its proper divisors (25460431).

28621425 is a wasteful number, since it uses less digits than its factorization.

28621425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54537 (or 54532 counting only the distinct ones).

The product of its digits is 7680, while the sum is 30.

The square root of 28621425 is about 5349.8995317669. The cubic root of 28621425 is about 305.8889233310. Note that the first 3 decimals are identical.

The spelling of 28621425 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred twenty-five".