261869764 has 12 divisors (see below), whose sum is σ = 493523884. Its totient is φ = 120862944.

The previous prime is 261869737. The next prime is 261869791. The reversal of 261869764 is 467968162.

It is an interprime number because it is at equal distance from previous prime (261869737) and next prime (261869791).

It can be written as a sum of positive squares in 2 ways, for example, as 17572864 + 244296900 = 4192^2 + 15630^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2517927 + ... + 2518030.

Almost surely, 2^261869764 is an apocalyptic number.

It is an amenable number.

261869764 is a deficient number, since it is larger than the sum of its proper divisors (231654120).

261869764 is a wasteful number, since it uses less digits than its factorization.

261869764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5035974 (or 5035972 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 261869764 is about 16182.3905526965. The cubic root of 261869764 is about 639.7767483039.

The spelling of 261869764 in words is "two hundred sixty-one million, eight hundred sixty-nine thousand, seven hundred sixty-four".