261298836 has 36 divisors (see below), whose sum is σ = 661224564. Its totient is φ = 87004800.

The previous prime is 261298819. The next prime is 261298853. The reversal of 261298836 is 638892162.

261298836 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (261298819) and next prime (261298853).

It can be written as a sum of positive squares in 2 ways, for example, as 185504400 + 75794436 = 13620^2 + 8706^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 261298791 and 261298800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34776 + ... + 41616.

It is an arithmetic number, because the mean of its divisors is an integer number (18367349).

Almost surely, 2^261298836 is an apocalyptic number.

It is an amenable number.

261298836 is an abundant number, since it is smaller than the sum of its proper divisors (399925728).

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

261298836 is a wasteful number, since it uses less digits than its factorization.

261298836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912 (or 7907 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 261298836 is about 16164.7405175586. The cubic root of 261298836 is about 639.3114632873.

The spelling of 261298836 in words is "two hundred sixty-one million, two hundred ninety-eight thousand, eight hundred thirty-six".