261340002 has 96 divisors (see below), whose sum is σ = 711045504. Its totient is φ = 67392000.

The previous prime is 261339989. The next prime is 261340021. The reversal of 261340002 is 200043162.

It is a happy number.

261340002 is a `hidden beast` number, since 261 + 3 + 400 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 217002 + ... + 218202.

It is an arithmetic number, because the mean of its divisors is an integer number (7406724).

Almost surely, 2^261340002 is an apocalyptic number.

261340002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 261340002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (355522752).

261340002 is an abundant number, since it is smaller than the sum of its proper divisors (449705502).

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

261340002 is a wasteful number, since it uses less digits than its factorization.

261340002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 261340002 is about 16166.0137943774. The cubic root of 261340002 is about 639.3450347007.

Adding to 261340002 its reverse (200043162), we get a palindrome (461383164).

The spelling of 261340002 in words is "two hundred sixty-one million, three hundred forty thousand, two".