261800870 has 16 divisors (see below), whose sum is σ = 472423968. Its totient is φ = 104457600.

The previous prime is 261800843. The next prime is 261800873. The reversal of 261800870 is 78008162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261800873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28634 + ... + 36653.

It is an arithmetic number, because the mean of its divisors is an integer number (29526498).

Almost surely, 2^261800870 is an apocalyptic number.

261800870 is a deficient number, since it is larger than the sum of its proper divisors (210623098).

261800870 is a wasteful number, since it uses less digits than its factorization.

261800870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65695.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 261800870 is about 16180.2617407754. The cubic root of 261800870 is about 639.7206381666.

The spelling of 261800870 in words is "two hundred sixty-one million, eight hundred thousand, eight hundred seventy".