260911640 has 64 divisors (see below), whose sum is σ = 650985120. Its totient is φ = 93312000.

The previous prime is 260911627. The next prime is 260911657. The reversal of 260911640 is 46119062.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 21980 + ... + 31700.

Almost surely, 2^260911640 is an apocalyptic number.

260911640 is a gapful number since it is divisible by the number (20) 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 260911640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (325492560).

260911640 is an abundant number, since it is smaller than the sum of its proper divisors (390073480).

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

260911640 is a wasteful number, since it uses less digits than its factorization.

260911640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9804 (or 9800 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 260911640 is about 16152.7595165656. The cubic root of 260911640 is about 638.9955271805.

The spelling of 260911640 in words is "two hundred sixty million, nine hundred eleven thousand, six hundred forty".