28478980 has 12 divisors (see below), whose sum is σ = 59805900. Its totient is φ = 11391584.

The previous prime is 28478977. The next prime is 28479041. The reversal of 28478980 is 8987482.

It can be written as a sum of positive squares in 2 ways, for example, as 10653696 + 17825284 = 3264^2 + 4222^2 .

It is a super-2 number, since 2×28478980² = 1622104603680800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28478980.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711955 + ... + 711994.

It is an arithmetic number, because the mean of its divisors is an integer number (4983825).

Almost surely, 2^28478980 is an apocalyptic number.

28478980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28478980 is an abundant number, since it is smaller than the sum of its proper divisors (31326920).

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

28478980 is a wasteful number, since it uses less digits than its factorization.

28478980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423958 (or 1423956 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 28478980 is about 5336.5700595045. The cubic root of 28478980 is about 305.3806230770.

The spelling of 28478980 in words is "twenty-eight million, four hundred seventy-eight thousand, nine hundred eighty".