28811430 has 64 divisors (see below), whose sum is σ = 81362880. Its totient is φ = 7229952.

The previous prime is 28811401. The next prime is 28811441. The reversal of 28811430 is 3411882.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28811394 and 28811403.

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, 1452 + ... + 7728.

It is an arithmetic number, because the mean of its divisors is an integer number (1271295).

Almost surely, 2^28811430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28811430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40681440).

28811430 is an abundant number, since it is smaller than the sum of its proper divisors (52551450).

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

28811430 is a wasteful number, since it uses less digits than its factorization.

28811430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6310 (or 6304 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28811430 is about 5367.6279677340. The cubic root of 28811430 is about 306.5643181349.

It can be divided in two parts, 28811 and 430, that added together give a square (29241 = 171²).

The spelling of 28811430 in words is "twenty-eight million, eight hundred eleven thousand, four hundred thirty".