261323870 has 8 divisors (see below), whose sum is σ = 470382984. Its totient is φ = 104529544.

The previous prime is 261323851. The next prime is 261323927. The reversal of 261323870 is 78323162.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 13066184 + ... + 13066203.

It is an arithmetic number, because the mean of its divisors is an integer number (58797873).

Almost surely, 2^261323870 is an apocalyptic number.

261323870 is a deficient number, since it is larger than the sum of its proper divisors (209059114).

261323870 is a wasteful number, since it uses less digits than its factorization.

261323870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26132394.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 261323870 is about 16165.5148386929. The cubic root of 261323870 is about 639.3318792630.

The spelling of 261323870 in words is "two hundred sixty-one million, three hundred twenty-three thousand, eight hundred seventy".