28149480 has 48 divisors (see below), whose sum is σ = 91486980. Its totient is φ = 7506432.

The previous prime is 28149479. The next prime is 28149481. The reversal of 28149480 is 8494182.

It is an interprime number because it is at equal distance from previous prime (28149479) and next prime (28149481).

It can be written as a sum of positive squares in 2 ways, for example, as 23561316 + 4588164 = 4854^2 + 2142^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28149481) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 38737 + ... + 39456.

Almost surely, 2^28149480 is an apocalyptic number.

28149480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28149480 is an abundant number, since it is smaller than the sum of its proper divisors (63337500).

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

28149480 is a wasteful number, since it uses less digits than its factorization.

28149480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78210 (or 78203 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 28149480 is about 5305.6083534313. The cubic root of 28149480 is about 304.1983066688.

The spelling of 28149480 in words is "twenty-eight million, one hundred forty-nine thousand, four hundred eighty".