28963880 has 32 divisors (see below), whose sum is σ = 71094240. Its totient is φ = 10532160.

The previous prime is 28963873. The next prime is 28963919. The reversal of 28963880 is 8836982.

28963880 = T₂₄₃ + T₂₄₄ + ... + T₅₇₂.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 32474 + ... + 33353.

It is an arithmetic number, because the mean of its divisors is an integer number (2221695).

Almost surely, 2^28963880 is an apocalyptic number.

28963880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28963880 is an abundant number, since it is smaller than the sum of its proper divisors (42130360).

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

28963880 is a wasteful number, since it uses less digits than its factorization.

28963880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65849 (or 65845 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 28963880 is about 5381.8101044165. The cubic root of 28963880 is about 307.1040754557.

It can be divided in two parts, 2896 and 3880, that added together give a palindrome (6776).

The spelling of 28963880 in words is "twenty-eight million, nine hundred sixty-three thousand, eight hundred eighty".