261974064 has 40 divisors (see below), whose sum is σ = 738292032. Its totient is φ = 79385920.

The previous prime is 261974059. The next prime is 261974107. The reversal of 261974064 is 460479162.

It is a happy number.

261974064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 247554 + ... + 248609.

Almost surely, 2^261974064 is an apocalyptic number.

261974064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261974064 is an abundant number, since it is smaller than the sum of its proper divisors (476317968).

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

261974064 is a wasteful number, since it uses less digits than its factorization.

261974064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496185 (or 496179 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 261974064 is about 16185.6128706948. The cubic root of 261974064 is about 639.8616758351.

The spelling of 261974064 in words is "two hundred sixty-one million, nine hundred seventy-four thousand, sixty-four".