28401401 has 4 divisors (see below), whose sum is σ = 32458752. Its totient is φ = 24344052.

The previous prime is 28401379. The next prime is 28401419. The reversal of 28401401 is 10410482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28401401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28401421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028665 + ... + 2028678.

It is an arithmetic number, because the mean of its divisors is an integer number (8114688).

Almost surely, 2^28401401 is an apocalyptic number.

It is an amenable number.

28401401 is a deficient number, since it is larger than the sum of its proper divisors (4057351).

28401401 is an equidigital number, since it uses as much as digits as its factorization.

28401401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4057350.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 28401401 is about 5329.2964826513. The cubic root of 28401401 is about 305.1030772269.

Adding to 28401401 its reverse (10410482), we get a palindrome (38811883).

The spelling of 28401401 in words is "twenty-eight million, four hundred one thousand, four hundred one".