261785364 has 24 divisors (see below), whose sum is σ = 614035968. Its totient is φ = 86804160.

The previous prime is 261785357. The next prime is 261785387. The reversal of 261785364 is 463587162.

261785364 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×261785364² = 137063153609224992, which contains 22 as substring.

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, 54817 + ... + 59400.

It is an arithmetic number, because the mean of its divisors is an integer number (25584832).

Almost surely, 2^261785364 is an apocalyptic number.

It is an amenable number.

261785364 is an abundant number, since it is smaller than the sum of its proper divisors (352250604).

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

261785364 is a wasteful number, since it uses less digits than its factorization.

261785364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114415 (or 114413 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 261785364 is about 16179.7825696145. The cubic root of 261785364 is about 639.7080080787.

The spelling of 261785364 in words is "two hundred sixty-one million, seven hundred eighty-five thousand, three hundred sixty-four".