261154064 has 20 divisors (see below), whose sum is σ = 506282700. Its totient is φ = 130500480.

The previous prime is 261154063. The next prime is 261154073. The reversal of 261154064 is 460451162.

It can be written as a sum of positive squares in 2 ways, for example, as 178489600 + 82664464 = 13360^2 + 9092^2 .

It is not an unprimeable number, because it can be changed into a prime (261154063) 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, 31862 + ... + 39210.

It is an arithmetic number, because the mean of its divisors is an integer number (25314135).

Almost surely, 2^261154064 is an apocalyptic number.

It is an amenable number.

261154064 is a deficient number, since it is larger than the sum of its proper divisors (245128636).

261154064 is a wasteful number, since it uses less digits than its factorization.

261154064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9578 (or 9572 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 261154064 is about 16160.2618790662. The cubic root of 261154064 is about 639.1933718088.

The spelling of 261154064 in words is "two hundred sixty-one million, one hundred fifty-four thousand, sixty-four".