261428244 has 216 divisors, whose sum is σ = 823152960. Its totient is φ = 63191040.

The previous prime is 261428231. The next prime is 261428269. The reversal of 261428244 is 442824162.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2937352 + ... + 2937440.

Almost surely, 2^261428244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261428244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411576480).

261428244 is an abundant number, since it is smaller than the sum of its proper divisors (561724716).

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

261428244 is a wasteful number, since it uses less digits than its factorization.

261428244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 129 counting only the distinct ones).

The product of its digits is 24576, while the sum is 33.

The square root of 261428244 is about 16168.7428082705. The cubic root of 261428244 is about 639.4169853340.

The spelling of 261428244 in words is "two hundred sixty-one million, four hundred twenty-eight thousand, two hundred forty-four".