261028456 has 32 divisors (see below), whose sum is σ = 533017800. Its totient is φ = 119116800.

The previous prime is 261028399. The next prime is 261028477. The reversal of 261028456 is 654820162.

It can be written as a sum of positive squares in 4 ways, for example, as 160427556 + 100600900 = 12666^2 + 10030^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4845 + ... + 23356.

Almost surely, 2^261028456 is an apocalyptic number.

261028456 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

261028456 is an abundant number, since it is smaller than the sum of its proper divisors (271989344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261028456 is a wasteful number, since it uses less digits than its factorization.

261028456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28309 (or 28305 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 261028456 is about 16156.3750884906. The cubic root of 261028456 is about 639.0908771672.

The spelling of 261028456 in words is "two hundred sixty-one million, twenty-eight thousand, four hundred fifty-six".