261279064 has 16 divisors (see below), whose sum is σ = 490106520. Its totient is φ = 130584000.

The previous prime is 261279061. The next prime is 261279071. The reversal of 261279064 is 460972162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261279061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18567 + ... + 29449.

Almost surely, 2^261279064 is an apocalyptic number.

It is an amenable number.

261279064 is a deficient number, since it is larger than the sum of its proper divisors (228827456).

261279064 is a wasteful number, since it uses less digits than its factorization.

261279064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13890 (or 13886 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 261279064 is about 16164.1289279689. The cubic root of 261279064 is about 639.2953377083.

The spelling of 261279064 in words is "two hundred sixty-one million, two hundred seventy-nine thousand, sixty-four".