261216700 has 18 divisors (see below), whose sum is σ = 566840456. Its totient is φ = 104486640.

The previous prime is 261216689. The next prime is 261216737. The reversal of 261216700 is 7612162.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 1305984 + ... + 1306183.

Almost surely, 2^261216700 is an apocalyptic number.

261216700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261216700 is an abundant number, since it is smaller than the sum of its proper divisors (305623756).

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

261216700 is a wasteful number, since it uses less digits than its factorization.

261216700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612181 (or 2612174 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 261216700 is about 16162.1997265224. The cubic root of 261216700 is about 639.2444697636.

Adding to 261216700 its reverse (7612162), we get a palindrome (268828862).

The spelling of 261216700 in words is "two hundred sixty-one million, two hundred sixteen thousand, seven hundred".