1260691640 has 96 divisors (see below), whose sum is σ = 3194039520. Its totient is φ = 445150464.

The previous prime is 1260691613. The next prime is 1260691651. The reversal of 1260691640 is 461960621.

It is a super-2 number, since 2×1260691640² = 3178686822331779200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1260691640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 272789 + ... + 277371.

It is an arithmetic number, because the mean of its divisors is an integer number (33271245).

Almost surely, 2^1260691640 is an apocalyptic number.

1260691640 is a gapful number since it is divisible by the number (10) 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 1260691640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1597019760).

1260691640 is an abundant number, since it is smaller than the sum of its proper divisors (1933347880).

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

1260691640 is a wasteful number, since it uses less digits than its factorization.

1260691640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4653 (or 4626 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 1260691640 is about 35506.2197368292. The cubic root of 1260691640 is about 1080.2798885929.

The spelling of 1260691640 in words is "one billion, two hundred sixty million, six hundred ninety-one thousand, six hundred forty".