261635160 has 32 divisors (see below), whose sum is σ = 784905840. Its totient is φ = 69769344.

The previous prime is 261635131. The next prime is 261635183. The reversal of 261635160 is 61536162.

261635160 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1090027 + ... + 1090266.

Almost surely, 2^261635160 is an apocalyptic number.

261635160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261635160 is an abundant number, since it is smaller than the sum of its proper divisors (523270680).

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

261635160 is a wasteful number, since it uses less digits than its factorization.

261635160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2180307 (or 2180303 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 261635160 is about 16175.1401848639. The cubic root of 261635160 is about 639.5856367294.

The spelling of 261635160 in words is "two hundred sixty-one million, six hundred thirty-five thousand, one hundred sixty".