28407404 has 6 divisors (see below), whose sum is σ = 49712964. Its totient is φ = 14203700.

The previous prime is 28407403. The next prime is 28407473. The reversal of 28407404 is 40470482.

It is not an unprimeable number, because it can be changed into a prime (28407403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3550922 + ... + 3550929.

It is an arithmetic number, because the mean of its divisors is an integer number (8285494).

Almost surely, 2^28407404 is an apocalyptic number.

It is an amenable number.

28407404 is a deficient number, since it is larger than the sum of its proper divisors (21305560).

28407404 is a wasteful number, since it uses less digits than its factorization.

28407404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7101855 (or 7101853 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 29.

The square root of 28407404 is about 5329.8596604414. The cubic root of 28407404 is about 305.1245715275.

Adding to 28407404 its reverse (40470482), we get a palindrome (68877886).

The spelling of 28407404 in words is "twenty-eight million, four hundred seven thousand, four hundred four".