280157225 has 6 divisors (see below), whose sum is σ = 347394990. Its totient is φ = 224125760.

The previous prime is 280157221. The next prime is 280157231. The reversal of 280157225 is 522751082.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 32126224 + 248031001 = 5668^2 + 15749^2 .

It is not a de Polignac number, because 280157225 - 2² = 280157221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 280157191 and 280157200.

It is not an unprimeable number, because it can be changed into a prime (280157221) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 5603120 + ... + 5603169.

It is an arithmetic number, because the mean of its divisors is an integer number (57899165).

Almost surely, 2^280157225 is an apocalyptic number.

280157225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

280157225 is a deficient number, since it is larger than the sum of its proper divisors (67237765).

280157225 is a wasteful number, since it uses less digits than its factorization.

280157225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11206299 (or 11206294 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 280157225 is about 16737.8978668171. The cubic root of 280157225 is about 654.3356899351.

The spelling of 280157225 in words is "two hundred eighty million, one hundred fifty-seven thousand, two hundred twenty-five".