261037648 has 10 divisors (see below), whose sum is σ = 505760474. Its totient is φ = 130518816.

The previous prime is 261037643. The next prime is 261037681. The reversal of 261037648 is 846730162.

It can be written as a sum of positive squares in only one way, i.e., 260887104 + 150544 = 16152^2 + 388^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261037643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8157411 + ... + 8157442.

Almost surely, 2^261037648 is an apocalyptic number.

It is an amenable number.

261037648 is a deficient number, since it is larger than the sum of its proper divisors (244722826).

261037648 is a wasteful number, since it uses less digits than its factorization.

261037648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16314861 (or 16314855 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 261037648 is about 16156.6595557374. The cubic root of 261037648 is about 639.0983788454.

The spelling of 261037648 in words is "two hundred sixty-one million, thirty-seven thousand, six hundred forty-eight".