261602705 has 48 divisors (see below), whose sum is σ = 397177344. Its totient is φ = 161890560.

The previous prime is 261602701. The next prime is 261602711. The reversal of 261602705 is 507206162.

It is not a de Polignac number, because 261602705 - 2² = 261602701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261602701) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 277535 + ... + 278475.

It is an arithmetic number, because the mean of its divisors is an integer number (8274528).

Almost surely, 2^261602705 is an apocalyptic number.

It is an amenable number.

261602705 is a deficient number, since it is larger than the sum of its proper divisors (135574639).

261602705 is a wasteful number, since it uses less digits than its factorization.

261602705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 261602705 is about 16174.1369166951. The cubic root of 261602705 is about 639.5591894555.

Adding to 261602705 its reverse (507206162), we get a palindrome (768808867).

The spelling of 261602705 in words is "two hundred sixty-one million, six hundred two thousand, seven hundred five".