28471225 has 6 divisors (see below), whose sum is σ = 35304350. Its totient is φ = 22776960.

The previous prime is 28471211. The next prime is 28471249. The reversal of 28471225 is 52217482.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 8543929 + 19927296 = 2923^2 + 4464^2 .

It is not a de Polignac number, because 28471225 - 2¹⁵ = 28438457 is a prime.

It is a super-2 number, since 2×28471225² = 1621221306001250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 569400 + ... + 569449.

Almost surely, 2^28471225 is an apocalyptic number.

28471225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28471225 is a deficient number, since it is larger than the sum of its proper divisors (6833125).

28471225 is a wasteful number, since it uses less digits than its factorization.

28471225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138859 (or 1138854 counting only the distinct ones).

The product of its digits is 8960, while the sum is 31.

The square root of 28471225 is about 5335.8434197416. The cubic root of 28471225 is about 305.3529015584.

The spelling of 28471225 in words is "twenty-eight million, four hundred seventy-one thousand, two hundred twenty-five".