261955624 has 16 divisors (see below), whose sum is σ = 561333600. Its totient is φ = 112266672.

The previous prime is 261955607. The next prime is 261955633. The reversal of 261955624 is 426559162.

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, 2338834 + ... + 2338945.

It is an arithmetic number, because the mean of its divisors is an integer number (35083350).

Almost surely, 2^261955624 is an apocalyptic number.

It is an amenable number.

261955624 is an abundant number, since it is smaller than the sum of its proper divisors (299377976).

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

261955624 is a wasteful number, since it uses less digits than its factorization.

261955624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4677792 (or 4677788 counting only the distinct ones).

The product of its digits is 129600, while the sum is 40.

The square root of 261955624 is about 16185.0432189723. The cubic root of 261955624 is about 639.8466624836.

The spelling of 261955624 in words is "two hundred sixty-one million, nine hundred fifty-five thousand, six hundred twenty-four".