28207472 has 20 divisors (see below), whose sum is σ = 54777000. Its totient is φ = 14071488.

The previous prime is 28207463. The next prime is 28207481. The reversal of 28207472 is 27470282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28207463) and next prime (28207481).

It is a super-2 number, since 2×28207472² = 1591322953261568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6218 + ... + 9750.

It is an arithmetic number, because the mean of its divisors is an integer number (2738850).

Almost surely, 2^28207472 is an apocalyptic number.

It is an amenable number.

28207472 is a deficient number, since it is larger than the sum of its proper divisors (26569528).

28207472 is a wasteful number, since it uses less digits than its factorization.

28207472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4040 (or 4034 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 28207472 is about 5311.0707018453. The cubic root of 28207472 is about 304.4070608822.

The spelling of 28207472 in words is "twenty-eight million, two hundred seven thousand, four hundred seventy-two".