28402101 has 24 divisors (see below), whose sum is σ = 50494080. Its totient is φ = 14980896.

The previous prime is 28402097. The next prime is 28402103. The reversal of 28402101 is 10120482.

It is not a de Polignac number, because 28402101 - 2² = 28402097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402103) 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 23 ways as a sum of consecutive naturals, for example, 16521 + ... + 18158.

It is an arithmetic number, because the mean of its divisors is an integer number (2103920).

Almost surely, 2^28402101 is an apocalyptic number.

28402101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28402101 is a deficient number, since it is larger than the sum of its proper divisors (22091979).

28402101 is a wasteful number, since it uses less digits than its factorization.

28402101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34705 (or 34702 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28402101 is about 5329.3621569565. The cubic root of 28402101 is about 305.1055837981.

Adding to 28402101 its reverse (10120482), we get a palindrome (38522583).

The spelling of 28402101 in words is "twenty-eight million, four hundred two thousand, one hundred one".