261370668 has 54 divisors (see below), whose sum is σ = 662230884. Its totient is φ = 80197728.

The previous prime is 261370657. The next prime is 261370673. The reversal of 261370668 is 866073162.

261370668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 727873 + ... + 728231.

Almost surely, 2^261370668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261370668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331115442).

261370668 is an abundant number, since it is smaller than the sum of its proper divisors (400860216).

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

261370668 is a wasteful number, since it uses less digits than its factorization.

261370668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 261370668 is about 16166.9622378479. The cubic root of 261370668 is about 639.3700409351.

The spelling of 261370668 in words is "two hundred sixty-one million, three hundred seventy thousand, six hundred sixty-eight".