261335830 has 32 divisors (see below), whose sum is σ = 541728000. Its totient is φ = 88913760.

The previous prime is 261335827. The next prime is 261335863. The reversal of 261335830 is 38533162.

It is a super-4 number, since 4×261335830⁴ (a number of 35 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 261335792 and 261335801.

It is a congruent number.

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, 5080 + ... + 23419.

It is an arithmetic number, because the mean of its divisors is an integer number (16929000).

Almost surely, 2^261335830 is an apocalyptic number.

261335830 is an abundant number, since it is smaller than the sum of its proper divisors (280392170).

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

261335830 is a wasteful number, since it uses less digits than its factorization.

261335830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28644.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 261335830 is about 16165.8847577236. The cubic root of 261335830 is about 639.3416325405.

Adding to 261335830 its reverse (38533162), we get a palindrome (299868992).

The spelling of 261335830 in words is "two hundred sixty-one million, three hundred thirty-five thousand, eight hundred thirty".