261263020 has 24 divisors (see below), whose sum is σ = 548956800. Its totient is φ = 104447232.

The previous prime is 261263017. The next prime is 261263027. The reversal of 261263020 is 20362162.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 261262982 and 261263000.

It is not an unprimeable number, because it can be changed into a prime (261263027) 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, 65236 + ... + 69124.

It is an arithmetic number, because the mean of its divisors is an integer number (22873200).

Almost surely, 2^261263020 is an apocalyptic number.

261263020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261263020 is an abundant number, since it is smaller than the sum of its proper divisors (287693780).

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

261263020 is a wasteful number, since it uses less digits than its factorization.

261263020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7257 (or 7255 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 261263020 is about 16163.6326362609. The cubic root of 261263020 is about 639.2822520006.

The spelling of 261263020 in words is "two hundred sixty-one million, two hundred sixty-three thousand, twenty".