261220024 has 32 divisors (see below), whose sum is σ = 528247440. Its totient is φ = 120384000.

The previous prime is 261220021. The next prime is 261220121. The reversal of 261220024 is 420022162.

It is a junction number, because it is equal to n+sod(n) for n = 261219983 and 261220010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261220021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90199 + ... + 93049.

Almost surely, 2^261220024 is an apocalyptic number.

It is an amenable number.

261220024 is an abundant number, since it is smaller than the sum of its proper divisors (267027416).

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

261220024 is a wasteful number, since it uses less digits than its factorization.

261220024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3751 (or 3747 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 261220024 is about 16162.3025587322. The cubic root of 261220024 is about 639.2471812283.

Adding to 261220024 its reverse (420022162), we get a palindrome (681242186).

The spelling of 261220024 in words is "two hundred sixty-one million, two hundred twenty thousand, twenty-four".