28904860 has 24 divisors (see below), whose sum is σ = 60935616. Its totient is φ = 11517120.

The previous prime is 28904849. The next prime is 28904891. The reversal of 28904860 is 6840982.

It is a super-3 number, since 3×28904860³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2754 + ... + 8086.

It is an arithmetic number, because the mean of its divisors is an integer number (2538984).

Almost surely, 2^28904860 is an apocalyptic number.

28904860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28904860 is an abundant number, since it is smaller than the sum of its proper divisors (32030756).

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

28904860 is a wasteful number, since it uses less digits than its factorization.

28904860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5613 (or 5611 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 28904860 is about 5376.3240229733. The cubic root of 28904860 is about 306.8953372175.

It can be divided in two parts, 2890 and 4860, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 28904860 in words is "twenty-eight million, nine hundred four thousand, eight hundred sixty".