261007620 has 48 divisors (see below), whose sum is σ = 750579648. Its totient is φ = 67720320.

The previous prime is 261007589. The next prime is 261007639. The reversal of 261007620 is 26700162.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56566 + ... + 61005.

It is an arithmetic number, because the mean of its divisors is an integer number (15637076).

Almost surely, 2^261007620 is an apocalyptic number.

261007620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261007620 is an abundant number, since it is smaller than the sum of its proper divisors (489572028).

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

261007620 is a wasteful number, since it uses less digits than its factorization.

261007620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117620 (or 117618 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 261007620 is about 16155.7302527617. The cubic root of 261007620 is about 639.0738720585.

Adding to 261007620 its reverse (26700162), we get a palindrome (287707782).

The spelling of 261007620 in words is "two hundred sixty-one million, seven thousand, six hundred twenty".