225640779 has 32 divisors (see below), whose sum is σ = 392071680. Its totient is φ = 112015872.

The previous prime is 225640771. The next prime is 225640817. The reversal of 225640779 is 977046522.

It is not a de Polignac number, because 225640779 - 2³ = 225640771 is a prime.

It is a super-2 number, since 2×225640779² = 101827522295453682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 225640779.

It is not an unprimeable number, because it can be changed into a prime (225640771) 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 31 ways as a sum of consecutive naturals, for example, 19669 + ... + 28950.

It is an arithmetic number, because the mean of its divisors is an integer number (12252240).

Almost surely, 2^225640779 is an apocalyptic number.

225640779 is a deficient number, since it is larger than the sum of its proper divisors (166430901).

225640779 is a wasteful number, since it uses less digits than its factorization.

225640779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48659.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 225640779 is about 15021.3441142928. The cubic root of 225640779 is about 608.7970370973.

The spelling of 225640779 in words is "two hundred twenty-five million, six hundred forty thousand, seven hundred seventy-nine".