28401004 has 12 divisors (see below), whose sum is σ = 50639904. Its totient is φ = 13932464.

The previous prime is 28400971. The next prime is 28401013. The reversal of 28401004 is 40010482.

It is a super-3 number, since 3×28401004³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66772 + ... + 67195.

It is an arithmetic number, because the mean of its divisors is an integer number (4219992).

Almost surely, 2^28401004 is an apocalyptic number.

It is an amenable number.

28401004 is a deficient number, since it is larger than the sum of its proper divisors (22238900).

28401004 is a wasteful number, since it uses less digits than its factorization.

28401004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134024 (or 134022 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 28401004 is about 5329.2592355786. The cubic root of 28401004 is about 305.1016556247.

Adding to 28401004 its reverse (40010482), we get a palindrome (68411486).

It can be divided in two parts, 2840 and 1004, that added together give a square (3844 = 62²).

The spelling of 28401004 in words is "twenty-eight million, four hundred one thousand, four".