261086976 has 126 divisors (see below), whose sum is σ = 781932200. Its totient is φ = 86966784.

The previous prime is 261086963. The next prime is 261086983. The reversal of 261086976 is 679680162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 185925 + ... + 187323.

Almost surely, 2^261086976 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 261086976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390966100).

261086976 is an abundant number, since it is smaller than the sum of its proper divisors (520845224).

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

261086976 is an frugal number, since it uses more digits than its factorization.

261086976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433 (or 1404 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 261086976 is about 16158.1860368050. The cubic root of 261086976 is about 639.1386328847.

The spelling of 261086976 in words is "two hundred sixty-one million, eighty-six thousand, nine hundred seventy-six".