260891604 has 54 divisors (see below), whose sum is σ = 684874554. Its totient is φ = 86955120.

The previous prime is 260891597. The next prime is 260891611. The reversal of 260891604 is 406198062.

It is an interprime number because it is at equal distance from previous prime (260891597) and next prime (260891611).

It can be written as a sum of positive squares in only one way, i.e., 132296004 + 128595600 = 11502^2 + 11340^2 .

It is a tau number, because it is divible by the number of its divisors (54).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 21274 + ... + 31214.

Almost surely, 2^260891604 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 260891604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342437277).

260891604 is an abundant number, since it is smaller than the sum of its proper divisors (423982950).

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

260891604 is an frugal number, since it uses more digits than its factorization.

260891604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9969 (or 9946 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 260891604 is about 16152.1393010338. The cubic root of 260891604 is about 638.9791701204.

The spelling of 260891604 in words is "two hundred sixty million, eight hundred ninety-one thousand, six hundred four".