28420002 has 24 divisors (see below), whose sum is σ = 66313884. Its totient is φ = 8744544.

The previous prime is 28419967. The next prime is 28420027. The reversal of 28420002 is 20002482.

It can be written as a sum of positive squares in 2 ways, for example, as 28419561 + 441 = 5331^2 + 21^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 60493 + ... + 60960.

Almost surely, 2^28420002 is an apocalyptic number.

28420002 is an abundant number, since it is smaller than the sum of its proper divisors (37893882).

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

28420002 is a wasteful number, since it uses less digits than its factorization.

28420002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121474 (or 121471 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 28420002 is about 5331.0413616854. The cubic root of 28420002 is about 305.1696699962.

Adding to 28420002 its reverse (20002482), we get a palindrome (48422484).

The spelling of 28420002 in words is "twenty-eight million, four hundred twenty thousand, two".