4278690225 has 36 divisors (see below), whose sum is σ = 7670303836. Its totient is φ = 2279975040.

The previous prime is 4278690223. The next prime is 4278690239. The reversal of 4278690225 is 5220968724.

It can be written as a sum of positive squares in 6 ways, for example, as 470195856 + 3808494369 = 21684^2 + 61713^2 .

It is not a de Polignac number, because 4278690225 - 2¹ = 4278690223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4278690223) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 270639 + ... + 286011.

Almost surely, 2^4278690225 is an apocalyptic number.

4278690225 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4278690225 is a deficient number, since it is larger than the sum of its proper divisors (3391613611).

4278690225 is a wasteful number, since it uses less digits than its factorization.

4278690225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16626 (or 16618 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 4278690225 is about 65411.6979217020. The cubic root of 4278690225 is about 1623.4426389057.

The spelling of 4278690225 in words is "four billion, two hundred seventy-eight million, six hundred ninety thousand, two hundred twenty-five".