261264928 has 12 divisors (see below), whose sum is σ = 514365390. Its totient is φ = 130632448.

The previous prime is 261264907. The next prime is 261264943. The reversal of 261264928 is 829462162.

It can be written as a sum of positive squares in only one way, i.e., 146603664 + 114661264 = 12108^2 + 10708^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4082233 + ... + 4082296.

Almost surely, 2^261264928 is an apocalyptic number.

It is an amenable number.

261264928 is a deficient number, since it is larger than the sum of its proper divisors (253100462).

261264928 is an equidigital number, since it uses as much as digits as its factorization.

261264928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8164539 (or 8164531 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 261264928 is about 16163.6916575391. The cubic root of 261264928 is about 639.2838082198.

The spelling of 261264928 in words is "two hundred sixty-one million, two hundred sixty-four thousand, nine hundred twenty-eight".