28921002 has 32 divisors (see below), whose sum is σ = 66424320. Its totient is φ = 8302320.

The previous prime is 28920989. The next prime is 28921007. The reversal of 28921002 is 20012982.

It is not an unprimeable number, because it can be changed into a prime (28921007) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10278 + ... + 12785.

It is an arithmetic number, because the mean of its divisors is an integer number (2075760).

Almost surely, 2^28921002 is an apocalyptic number.

28921002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28921002 is an abundant number, since it is smaller than the sum of its proper divisors (37503318).

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

28921002 is a wasteful number, since it uses less digits than its factorization.

28921002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23098.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 28921002 is about 5377.8250250450. The cubic root of 28921002 is about 306.9524554397.

Adding to 28921002 its reverse (20012982), we get a palindrome (48933984).

The spelling of 28921002 in words is "twenty-eight million, nine hundred twenty-one thousand, two".