261690276 has 24 divisors (see below), whose sum is σ = 615071520. Its totient is φ = 86592832.

The previous prime is 261690271. The next prime is 261690283. The reversal of 261690276 is 672096162.

261690276 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261690271) 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, 77946 + ... + 81233.

It is an arithmetic number, because the mean of its divisors is an integer number (25627980).

Almost surely, 2^261690276 is an apocalyptic number.

It is an amenable number.

261690276 is an abundant number, since it is smaller than the sum of its proper divisors (353381244).

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

261690276 is a wasteful number, since it uses less digits than its factorization.

261690276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159323 (or 159321 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 261690276 is about 16176.8438207210. The cubic root of 261690276 is about 639.6305452283.

The spelling of 261690276 in words is "two hundred sixty-one million, six hundred ninety thousand, two hundred seventy-six".