261026620 has 24 divisors (see below), whose sum is σ = 557449200. Its totient is φ = 102640512.

The previous prime is 261026581. The next prime is 261026621. The reversal of 261026620 is 26620162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261026621) 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, 109425 + ... + 111784.

It is an arithmetic number, because the mean of its divisors is an integer number (23227050).

Almost surely, 2^261026620 is an apocalyptic number.

261026620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261026620 is an abundant number, since it is smaller than the sum of its proper divisors (296422580).

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

261026620 is a wasteful number, since it uses less digits than its factorization.

261026620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221277 (or 221275 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 261026620 is about 16156.3182687146. The cubic root of 261026620 is about 639.0893787692.

Adding to 261026620 its reverse (26620162), we get a palindrome (287646782).

The spelling of 261026620 in words is "two hundred sixty-one million, twenty-six thousand, six hundred twenty".