261490756 has 6 divisors (see below), whose sum is σ = 457608830. Its totient is φ = 130745376.

The previous prime is 261490721. The next prime is 261490781. The reversal of 261490756 is 657094162.

It can be written as a sum of positive squares in only one way, i.e., 255488256 + 6002500 = 15984^2 + 2450^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32686341 + ... + 32686348.

Almost surely, 2^261490756 is an apocalyptic number.

It is an amenable number.

261490756 is a deficient number, since it is larger than the sum of its proper divisors (196118074).

261490756 is a wasteful number, since it uses less digits than its factorization.

261490756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65372693 (or 65372691 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 261490756 is about 16170.6758052965. The cubic root of 261490756 is about 639.4679464805.

The spelling of 261490756 in words is "two hundred sixty-one million, four hundred ninety thousand, seven hundred fifty-six".