261115470 has 192 divisors, whose sum is σ = 868008960. Its totient is φ = 52876800.

The previous prime is 261115469. The next prime is 261115523. The reversal of 261115470 is 74511162.

It is a happy number.

261115470 is a `hidden beast` number, since 2 + 6 + 111 + 547 + 0 = 666.

261115470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 283671 + ... + 284589.

It is an arithmetic number, because the mean of its divisors is an integer number (4520880).

Almost surely, 2^261115470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261115470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (434004480).

261115470 is an abundant number, since it is smaller than the sum of its proper divisors (606893490).

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

261115470 is a wasteful number, since it uses less digits than its factorization.

261115470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 261115470 is about 16159.0677330098. The cubic root of 261115470 is about 639.1618830598.

It can be divided in two parts, 2611 and 15470, that added together give a palindrome (18081).

The spelling of 261115470 in words is "two hundred sixty-one million, one hundred fifteen thousand, four hundred seventy".