252778305 has 32 divisors (see below), whose sum is σ = 437584896. Its totient is φ = 123865344.

The previous prime is 252778301. The next prime is 252778313. The reversal of 252778305 is 503877252.

It is not a de Polignac number, because 252778305 - 2² = 252778301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (252778301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40579 + ... + 46391.

It is an arithmetic number, because the mean of its divisors is an integer number (13674528).

Almost surely, 2^252778305 is an apocalyptic number.

It is an amenable number.

252778305 is a deficient number, since it is larger than the sum of its proper divisors (184806591).

252778305 is a wasteful number, since it uses less digits than its factorization.

252778305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057.

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 252778305 is about 15899.0032706456. The cubic root of 252778305 is about 632.2855631817.

The spelling of 252778305 in words is "two hundred fifty-two million, seven hundred seventy-eight thousand, three hundred five".