28651428 has 48 divisors (see below), whose sum is σ = 79999360. Its totient is φ = 8815392.

The previous prime is 28651421. The next prime is 28651433. The reversal of 28651428 is 82415682.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28651392 and 28651401.

It is not an unprimeable number, because it can be changed into a prime (28651421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8800 + ... + 11607.

Almost surely, 2^28651428 is an apocalyptic number.

It is an amenable number.

28651428 is an abundant number, since it is smaller than the sum of its proper divisors (51347932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28651428 is a wasteful number, since it uses less digits than its factorization.

28651428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20433 (or 20425 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 28651428 is about 5352.7028686450. The cubic root of 28651428 is about 305.9957707989.

The spelling of 28651428 in words is "twenty-eight million, six hundred fifty-one thousand, four hundred twenty-eight".