261304434 has 32 divisors (see below), whose sum is σ = 596375040. Its totient is φ = 84746736.

The previous prime is 261304427. The next prime is 261304441. The reversal of 261304434 is 434403162.

261304434 is a `hidden beast` number, since 2 + 613 + 0 + 4 + 43 + 4 = 666.

261304434 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261304427) and next prime (261304441).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 261304398 and 261304407.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63394 + ... + 67389.

It is an arithmetic number, because the mean of its divisors is an integer number (18636720).

Almost surely, 2^261304434 is an apocalyptic number.

261304434 is an abundant number, since it is smaller than the sum of its proper divisors (335070606).

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

261304434 is a wasteful number, since it uses less digits than its factorization.

261304434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130831 (or 130825 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 261304434 is about 16164.9136712820. The cubic root of 261304434 is about 639.3160287369.

Adding to 261304434 its reverse (434403162), we get a palindrome (695707596).

The spelling of 261304434 in words is "two hundred sixty-one million, three hundred four thousand, four hundred thirty-four".