261364770 has 48 divisors (see below), whose sum is σ = 686300472. Its totient is φ = 69004800.

The previous prime is 261364739. The next prime is 261364771. The reversal of 261364770 is 77463162.

261364770 is a `hidden beast` number, since 2 + 6 + 1 + 3 + 647 + 7 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 259435449 + 1929321 = 16107^2 + 1389^2 .

It is not an unprimeable number, because it can be changed into a prime (261364771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5287 + ... + 23466.

Almost surely, 2^261364770 is an apocalyptic number.

261364770 is an abundant number, since it is smaller than the sum of its proper divisors (424935702).

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

261364770 is a wasteful number, since it uses less digits than its factorization.

261364770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28867 (or 28864 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 261364770 is about 16166.7798277826. The cubic root of 261364770 is about 639.3652316312.

The spelling of 261364770 in words is "two hundred sixty-one million, three hundred sixty-four thousand, seven hundred seventy".