261306608 has 20 divisors (see below), whose sum is σ = 506835120. Its totient is φ = 130510464.

The previous prime is 261306599. The next prime is 261306613. The reversal of 261306608 is 806603162.

It is a super-2 number, since 2×261306608² = 136562286768931328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7028 + ... + 23916.

It is an arithmetic number, because the mean of its divisors is an integer number (25341756).

Almost surely, 2^261306608 is an apocalyptic number.

It is an amenable number.

261306608 is a deficient number, since it is larger than the sum of its proper divisors (245528512).

261306608 is a wasteful number, since it uses less digits than its factorization.

261306608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17864 (or 17858 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 261306608 is about 16164.9809155470. The cubic root of 261306608 is about 639.3178017253.

The spelling of 261306608 in words is "two hundred sixty-one million, three hundred six thousand, six hundred eight".