261504030 has 64 divisors (see below), whose sum is σ = 699528960. Its totient is φ = 62175744.

The previous prime is 261504029. The next prime is 261504037. The reversal of 261504030 is 30405162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261503988 and 261504006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261504037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3804 + ... + 23183.

It is an arithmetic number, because the mean of its divisors is an integer number (10930140).

Almost surely, 2^261504030 is an apocalyptic number.

261504030 is an abundant number, since it is smaller than the sum of its proper divisors (438024930).

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

261504030 is a wasteful number, since it uses less digits than its factorization.

261504030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27033.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 261504030 is about 16171.0862343876. The cubic root of 261504030 is about 639.4787666895.

Adding to 261504030 its reverse (30405162), we get a palindrome (291909192).

The spelling of 261504030 in words is "two hundred sixty-one million, five hundred four thousand, thirty".