261484784 has 40 divisors (see below), whose sum is σ = 554153520. Its totient is φ = 118540800.

The previous prime is 261484771. The next prime is 261484801. The reversal of 261484784 is 487484162.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72332 + ... + 75860.

It is an arithmetic number, because the mean of its divisors is an integer number (13853838).

Almost surely, 2^261484784 is an apocalyptic number.

It is an amenable number.

261484784 is an abundant number, since it is smaller than the sum of its proper divisors (292668736).

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

261484784 is a wasteful number, since it uses less digits than its factorization.

261484784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3969 (or 3963 counting only the distinct ones).

The product of its digits is 344064, while the sum is 44.

The square root of 261484784 is about 16170.4911490035. The cubic root of 261484784 is about 639.4630783267.

The spelling of 261484784 in words is "two hundred sixty-one million, four hundred eighty-four thousand, seven hundred eighty-four".