261383630 has 16 divisors (see below), whose sum is σ = 485668224. Its totient is φ = 101180640.

The previous prime is 261383623. The next prime is 261383693. The reversal of 261383630 is 36383162.

It is a congruent number.

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, 421277 + ... + 421896.

It is an arithmetic number, because the mean of its divisors is an integer number (30354264).

Almost surely, 2^261383630 is an apocalyptic number.

261383630 is a deficient number, since it is larger than the sum of its proper divisors (224284594).

261383630 is a wasteful number, since it uses less digits than its factorization.

261383630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843211.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 261383630 is about 16167.3631121466. The cubic root of 261383630 is about 639.3806100597.

The spelling of 261383630 in words is "two hundred sixty-one million, three hundred eighty-three thousand, six hundred thirty".