28004880 has 40 divisors (see below), whose sum is σ = 86815872. Its totient is φ = 7467904.

The previous prime is 28004857. The next prime is 28004887. The reversal of 28004880 is 8840082.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28004887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58104 + ... + 58583.

Almost surely, 2^28004880 is an apocalyptic number.

28004880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28004880 is an abundant number, since it is smaller than the sum of its proper divisors (58810992).

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

28004880 is a wasteful number, since it uses less digits than its factorization.

28004880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116703 (or 116697 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 30.

The square root of 28004880 is about 5291.9637186965. The cubic root of 28004880 is about 303.6765372987.

The spelling of 28004880 in words is "twenty-eight million, four thousand, eight hundred eighty".