252778005 has 24 divisors (see below), whose sum is σ = 439417368. Its totient is φ = 134424576.

The previous prime is 252777991. The next prime is 252778013. The reversal of 252778005 is 500877252.

It can be written as a sum of positive squares in 4 ways, for example, as 46539684 + 206238321 = 6822^2 + 14361^2 .

It is not a de Polignac number, because 252778005 - 2⁹ = 252777493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7929 + ... + 23841.

It is an arithmetic number, because the mean of its divisors is an integer number (18309057).

Almost surely, 2^252778005 is an apocalyptic number.

It is an amenable number.

252778005 is a deficient number, since it is larger than the sum of its proper divisors (186639363).

252778005 is a wasteful number, since it uses less digits than its factorization.

252778005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16277 (or 16274 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 252778005 is about 15898.9938360891. The cubic root of 252778005 is about 632.2853130472.

The spelling of 252778005 in words is "two hundred fifty-two million, seven hundred seventy-eight thousand, five".