261554604 has 12 divisors (see below), whose sum is σ = 610294104. Its totient is φ = 87184864.

The previous prime is 261554581. The next prime is 261554609. The reversal of 261554604 is 406455162.

261554604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (261554609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10898097 + ... + 10898120.

It is an arithmetic number, because the mean of its divisors is an integer number (50857842).

Almost surely, 2^261554604 is an apocalyptic number.

It is an amenable number.

261554604 is an abundant number, since it is smaller than the sum of its proper divisors (348739500).

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

261554604 is a wasteful number, since it uses less digits than its factorization.

261554604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21796224 (or 21796222 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 261554604 is about 16172.6498756388. The cubic root of 261554604 is about 639.5199883799.

The spelling of 261554604 in words is "two hundred sixty-one million, five hundred fifty-four thousand, six hundred four".