261622704 has 160 divisors (see below), whose sum is σ = 822804480. Its totient is φ = 69970176.

The previous prime is 261622687. The next prime is 261622747. The reversal of 261622704 is 407226162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 682897 + ... + 683279.

It is an arithmetic number, because the mean of its divisors is an integer number (5142528).

Almost surely, 2^261622704 is an apocalyptic number.

261622704 is a gapful number since it is divisible by the number (24) 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 261622704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (411402240).

261622704 is an abundant number, since it is smaller than the sum of its proper divisors (561181776).

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

261622704 is a wasteful number, since it uses less digits than its factorization.

261622704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527 (or 521 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 261622704 is about 16174.7551449782. The cubic root of 261622704 is about 639.5754867109.

Adding to 261622704 its reverse (407226162), we get a palindrome (668848866).

The spelling of 261622704 in words is "two hundred sixty-one million, six hundred twenty-two thousand, seven hundred four".