28970280 has 48 divisors (see below), whose sum is σ = 94154580. Its totient is φ = 7725312.

The previous prime is 28970267. The next prime is 28970287. The reversal of 28970280 is 8207982.

It can be written as a sum of positive squares in 2 ways, for example, as 28965924 + 4356 = 5382^2 + 66^2 .

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 (28970287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39877 + ... + 40596.

Almost surely, 2^28970280 is an apocalyptic number.

28970280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28970280 is an abundant number, since it is smaller than the sum of its proper divisors (65184300).

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

28970280 is a wasteful number, since it uses less digits than its factorization.

28970280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80490 (or 80483 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28970280 is about 5382.4046670610. The cubic root of 28970280 is about 307.1266935273.

The spelling of 28970280 in words is "twenty-eight million, nine hundred seventy thousand, two hundred eighty".