261016804 has 12 divisors (see below), whose sum is σ = 464268028. Its totient is φ = 128368800.

The previous prime is 261016771. The next prime is 261016883. The reversal of 261016804 is 408610162.

It can be written as a sum of positive squares in 2 ways, for example, as 17656804 + 243360000 = 4202^2 + 15600^2 .

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, 534627 + ... + 535114.

Almost surely, 2^261016804 is an apocalyptic number.

It is an amenable number.

261016804 is a deficient number, since it is larger than the sum of its proper divisors (203251224).

261016804 is a wasteful number, since it uses less digits than its factorization.

261016804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069806 (or 1069804 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 261016804 is about 16156.0144837766. The cubic root of 261016804 is about 639.0813676067.

Adding to 261016804 its reverse (408610162), we get a palindrome (669626966).

The spelling of 261016804 in words is "two hundred sixty-one million, sixteen thousand, eight hundred four".