261051600 has 120 divisors (see below), whose sum is σ = 846633312. Its totient is φ = 68748800.

The previous prime is 261051563. The next prime is 261051601. The reversal of 261051600 is 6150162.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261051601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98290 + ... + 100910.

Almost surely, 2^261051600 is an apocalyptic number.

261051600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261051600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423316656).

261051600 is an abundant number, since it is smaller than the sum of its proper divisors (585581712).

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

261051600 is a wasteful number, since it uses less digits than its factorization.

261051600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2725 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 261051600 is about 16157.0913223884. The cubic root of 261051600 is about 639.1097648680.

The spelling of 261051600 in words is "two hundred sixty-one million, fifty-one thousand, six hundred".