261695364 has 48 divisors (see below), whose sum is σ = 707430528. Its totient is φ = 73744128.

The previous prime is 261695351. The next prime is 261695383. The reversal of 261695364 is 463596162.

261695364 is digitally balanced in base 2 and base 3, because in such bases 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 (42).

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, 15207 + ... + 27470.

It is an arithmetic number, because the mean of its divisors is an integer number (14738136).

Almost surely, 2^261695364 is an apocalyptic number.

It is an amenable number.

261695364 is an abundant number, since it is smaller than the sum of its proper divisors (445735164).

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

261695364 is a wasteful number, since it uses less digits than its factorization.

261695364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42764 (or 42762 counting only the distinct ones).

The product of its digits is 233280, while the sum is 42.

The square root of 261695364 is about 16177.0010817827. The cubic root of 261695364 is about 639.6346906111.

The spelling of 261695364 in words is "two hundred sixty-one million, six hundred ninety-five thousand, three hundred sixty-four".