261218604 has 24 divisors (see below), whose sum is σ = 610651888. Its totient is φ = 86909760.

The previous prime is 261218599. The next prime is 261218731. The reversal of 261218604 is 406812162.

261218604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13627 + ... + 26610.

Almost surely, 2^261218604 is an apocalyptic number.

It is an amenable number.

261218604 is an abundant number, since it is smaller than the sum of its proper divisors (349433284).

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

261218604 is a wasteful number, since it uses less digits than its factorization.

261218604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40785 (or 40783 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 261218604 is about 16162.2586292882. The cubic root of 261218604 is about 639.2460229038.

The spelling of 261218604 in words is "two hundred sixty-one million, two hundred eighteen thousand, six hundred four".