28401172 has 6 divisors (see below), whose sum is σ = 49702058. Its totient is φ = 14200584.

The previous prime is 28401167. The next prime is 28401221. The reversal of 28401172 is 27110482.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17338896 + 11062276 = 4164^2 + 3326^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3550143 + ... + 3550150.

Almost surely, 2^28401172 is an apocalyptic number.

It is an amenable number.

28401172 is a deficient number, since it is larger than the sum of its proper divisors (21300886).

28401172 is a wasteful number, since it uses less digits than its factorization.

28401172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7100297 (or 7100295 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 28401172 is about 5329.2749975958. The cubic root of 28401172 is about 305.1022572111.

The spelling of 28401172 in words is "twenty-eight million, four hundred one thousand, one hundred seventy-two".