261778704 has 80 divisors (see below), whose sum is σ = 748237824. Its totient is φ = 78198400.

The previous prime is 261778697. The next prime is 261778739. The reversal of 261778704 is 407877162.

261778704 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33997 + ... + 40979.

Almost surely, 2^261778704 is an apocalyptic number.

261778704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261778704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (374118912).

261778704 is an abundant number, since it is smaller than the sum of its proper divisors (486459120).

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

261778704 is a wasteful number, since it uses less digits than its factorization.

261778704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076 (or 7070 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 261778704 is about 16179.5767558982. The cubic root of 261778704 is about 639.7025831619.

The spelling of 261778704 in words is "two hundred sixty-one million, seven hundred seventy-eight thousand, seven hundred four".