209261264 has 20 divisors (see below), whose sum is σ = 407133540. Its totient is φ = 104194560.

The previous prime is 209261257. The next prime is 209261267. The reversal of 209261264 is 462162902.

It can be written as a sum of positive squares in 2 ways, for example, as 174451264 + 34810000 = 13208^2 + 5900^2 .

It is a super-2 number, since 2×209261264² = 87580553221755392, 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 209261264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209261267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23279 + ... + 30990.

It is an arithmetic number, because the mean of its divisors is an integer number (20356677).

Almost surely, 2^209261264 is an apocalyptic number.

It is an amenable number.

209261264 is a deficient number, since it is larger than the sum of its proper divisors (197872276).

209261264 is a wasteful number, since it uses less digits than its factorization.

209261264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54518 (or 54512 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 209261264 is about 14465.8654770463. The cubic root of 209261264 is about 593.6943939948.

The spelling of 209261264 in words is "two hundred nine million, two hundred sixty-one thousand, two hundred sixty-four".