261954630 has 48 divisors (see below), whose sum is σ = 778381344. Its totient is φ = 59875200.

The previous prime is 261954607. The next prime is 261954661. The reversal of 261954630 is 36459162.

It is a happy number.

261954630 is a `hidden beast` number, since 2 + 6 + 19 + 5 + 4 + 630 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207271 + ... + 208530.

It is an arithmetic number, because the mean of its divisors is an integer number (16216278).

Almost surely, 2^261954630 is an apocalyptic number.

261954630 is an abundant number, since it is smaller than the sum of its proper divisors (516426714).

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

261954630 is a wasteful number, since it uses less digits than its factorization.

261954630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415821 (or 415818 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 261954630 is about 16185.0125115800. The cubic root of 261954630 is about 639.8458531755.

The spelling of 261954630 in words is "two hundred sixty-one million, nine hundred fifty-four thousand, six hundred thirty".