28978232 has 8 divisors (see below), whose sum is σ = 54334200. Its totient is φ = 14489112.

The previous prime is 28978223. The next prime is 28978241. The reversal of 28978232 is 23287982.

It is an interprime number because it is at equal distance from previous prime (28978223) and next prime (28978241).

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 28978232.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1811132 + ... + 1811147.

It is an arithmetic number, because the mean of its divisors is an integer number (6791775).

Almost surely, 2^28978232 is an apocalyptic number.

It is an amenable number.

28978232 is a deficient number, since it is larger than the sum of its proper divisors (25355968).

28978232 is a wasteful number, since it uses less digits than its factorization.

28978232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622285 (or 3622281 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 28978232 is about 5383.1433196600. The cubic root of 28978232 is about 307.1547918410.

The spelling of 28978232 in words is "twenty-eight million, nine hundred seventy-eight thousand, two hundred thirty-two".