28130310 has 48 divisors (see below), whose sum is σ = 78768144. Its totient is φ = 6924096.

The previous prime is 28130303. The next prime is 28130321. The reversal of 28130310 is 1303182.

It is a super-2 number, since 2×28130310² = 1582628681392200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10852 + ... + 13191.

It is an arithmetic number, because the mean of its divisors is an integer number (1641003).

Almost surely, 2^28130310 is an apocalyptic number.

28130310 is an abundant number, since it is smaller than the sum of its proper divisors (50637834).

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

28130310 is a wasteful number, since it uses less digits than its factorization.

28130310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24069 (or 24066 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 28130310 is about 5303.8014668726. The cubic root of 28130310 is about 304.1292372366.

Adding to 28130310 its reverse (1303182), we get a palindrome (29433492).

The spelling of 28130310 in words is "twenty-eight million, one hundred thirty thousand, three hundred ten".