261278976 has 216 divisors, whose sum is σ = 830469024. Its totient is φ = 72683520.

The previous prime is 261278957. The next prime is 261278981. The reversal of 261278976 is 679872162.

It is a Harshad number since it is a multiple of its sum of digits (48).

Its product of digits (508032) is a multiple of the sum of its prime divisors (196).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1994431 + ... + 1994561.

It is an arithmetic number, because the mean of its divisors is an integer number (3844764).

Almost surely, 2^261278976 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 261278976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415234512).

261278976 is an abundant number, since it is smaller than the sum of its proper divisors (569190048).

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

261278976 is a wasteful number, since it uses less digits than its factorization.

261278976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 196 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 261278976 is about 16164.1262058919. The cubic root of 261278976 is about 639.2952659357.

The spelling of 261278976 in words is "two hundred sixty-one million, two hundred seventy-eight thousand, nine hundred seventy-six".