71280225 has 18 divisors (see below), whose sum is σ = 127671206. Its totient is φ = 38016000.

The previous prime is 71280221. The next prime is 71280227. The reversal of 71280225 is 52208217.

It can be written as a sum of positive squares in 3 ways, for example, as 63504 + 71216721 = 252^2 + 8439^2 .

It is not a de Polignac number, because 71280225 - 2² = 71280221 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71280221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 158176 + ... + 158625.

Almost surely, 2^71280225 is an apocalyptic number.

71280225 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

71280225 is a deficient number, since it is larger than the sum of its proper divisors (56390981).

71280225 is a wasteful number, since it uses less digits than its factorization.

71280225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316817 (or 316809 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 71280225 is about 8442.7616927164. The cubic root of 71280225 is about 414.6258300643.

The spelling of 71280225 in words is "seventy-one million, two hundred eighty thousand, two hundred twenty-five".