28130508 has 108 divisors (see below), whose sum is σ = 85149792. Its totient is φ = 7801920.

The previous prime is 28130503. The next prime is 28130513. The reversal of 28130508 is 80503182.

It is a happy number.

28130508 is a `hidden beast` number, since 28 + 130 + 508 = 666.

It is an interprime number because it is at equal distance from previous prime (28130503) and next prime (28130513).

It is not an unprimeable number, because it can be changed into a prime (28130503) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 65053 + ... + 65483.

It is an arithmetic number, because the mean of its divisors is an integer number (788424).

Almost surely, 2^28130508 is an apocalyptic number.

28130508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28130508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42574896).

28130508 is an abundant number, since it is smaller than the sum of its proper divisors (57019284).

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

28130508 is a wasteful number, since it uses less digits than its factorization.

28130508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28130508 is about 5303.8201326968. The cubic root of 28130508 is about 304.1299507902.

The spelling of 28130508 in words is "twenty-eight million, one hundred thirty thousand, five hundred eight".