28402984 has 8 divisors (see below), whose sum is σ = 53255610. Its totient is φ = 14201488.

The previous prime is 28402981. The next prime is 28402987. The reversal of 28402984 is 48920482.

It is an interprime number because it is at equal distance from previous prime (28402981) and next prime (28402987).

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 1258884 = 5210^2 + 1122^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28402981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775179 + ... + 1775194.

Almost surely, 2^28402984 is an apocalyptic number.

It is an amenable number.

28402984 is a deficient number, since it is larger than the sum of its proper divisors (24852626).

28402984 is a wasteful number, since it uses less digits than its factorization.

28402984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3550379 (or 3550375 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 28402984 is about 5329.4449992471. Note that the first 3 decimals coincide. The cubic root of 28402984 is about 305.1087455999.

The spelling of 28402984 in words is "twenty-eight million, four hundred two thousand, nine hundred eighty-four".