261443630 has 16 divisors (see below), whose sum is σ = 537827040. Its totient is φ = 89637792.

The previous prime is 261443617. The next prime is 261443653. The reversal of 261443630 is 36344162.

261443630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261443593 and 261443602.

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, 1867385 + ... + 1867524.

It is an arithmetic number, because the mean of its divisors is an integer number (33614190).

Almost surely, 2^261443630 is an apocalyptic number.

261443630 is an abundant number, since it is smaller than the sum of its proper divisors (276383410).

261443630 is a wasteful number, since it uses less digits than its factorization.

261443630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3734923.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 261443630 is about 16169.2185958382. The cubic root of 261443630 is about 639.4295290906.

Adding to 261443630 its reverse (36344162), we get a palindrome (297787792).

The spelling of 261443630 in words is "two hundred sixty-one million, four hundred forty-three thousand, six hundred thirty".