261137870 has 16 divisors (see below), whose sum is σ = 537198048. Its totient is φ = 89532960.

The previous prime is 261137861. The next prime is 261137873. The reversal of 261137870 is 78731162.

261137870 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 261137870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261137873) 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, 1865201 + ... + 1865340.

It is an arithmetic number, because the mean of its divisors is an integer number (33574878).

Almost surely, 2^261137870 is an apocalyptic number.

261137870 is an abundant number, since it is smaller than the sum of its proper divisors (276060178).

261137870 is a wasteful number, since it uses less digits than its factorization.

261137870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3730555.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 261137870 is about 16159.7608274380. The cubic root of 261137870 is about 639.1801595421.

The spelling of 261137870 in words is "two hundred sixty-one million, one hundred thirty-seven thousand, eight hundred seventy".