28402401 has 16 divisors (see below), whose sum is σ = 39896064. Its totient is φ = 17937744.

The previous prime is 28402391. The next prime is 28402411. The reversal of 28402401 is 10420482.

It is an interprime number because it is at equal distance from previous prime (28402391) and next prime (28402411).

It is not a de Polignac number, because 28402401 - 2⁶ = 28402337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28402411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5460 + ... + 9306.

It is an arithmetic number, because the mean of its divisors is an integer number (2493504).

Almost surely, 2^28402401 is an apocalyptic number.

It is an amenable number.

28402401 is a deficient number, since it is larger than the sum of its proper divisors (11493663).

28402401 is a wasteful number, since it uses less digits than its factorization.

28402401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 28402401 is about 5329.3903028395. The cubic root of 28402401 is about 305.1066580303.

Adding to 28402401 its reverse (10420482), we get a palindrome (38822883).

The spelling of 28402401 in words is "twenty-eight million, four hundred two thousand, four hundred one".