28501404 has 24 divisors (see below), whose sum is σ = 66892560. Its totient is φ = 9444864.

The previous prime is 28501399. The next prime is 28501409. The reversal of 28501404 is 40410582.

It is an interprime number because it is at equal distance from previous prime (28501399) and next prime (28501409).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28501409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4789 + ... + 8940.

It is an arithmetic number, because the mean of its divisors is an integer number (2787190).

Almost surely, 2^28501404 is an apocalyptic number.

It is an amenable number.

28501404 is an abundant number, since it is smaller than the sum of its proper divisors (38391156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28501404 is a wasteful number, since it uses less digits than its factorization.

28501404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13909 (or 13907 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 28501404 is about 5338.6706210442. The cubic root of 28501404 is about 305.4607530369.

Adding to 28501404 its reverse (40410582), we get a palindrome (68911986).

The spelling of 28501404 in words is "twenty-eight million, five hundred one thousand, four hundred four".