28815430 has 64 divisors (see below), whose sum is σ = 62668800. Its totient is φ = 9525600.

The previous prime is 28815407. The next prime is 28815443. The reversal of 28815430 is 3451882.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 28815392 and 28815401.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106195 + ... + 106465.

It is an arithmetic number, because the mean of its divisors is an integer number (979200).

Almost surely, 2^28815430 is an apocalyptic number.

28815430 is an abundant number, since it is smaller than the sum of its proper divisors (33853370).

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

28815430 is a wasteful number, since it uses less digits than its factorization.

28815430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28815430 is about 5368.0005588673. Note that the first 3 decimals coincide. The cubic root of 28815430 is about 306.5785046404.

The spelling of 28815430 in words is "twenty-eight million, eight hundred fifteen thousand, four hundred thirty".