1260657720 has 384 divisors, whose sum is σ = 4874688000. Its totient is φ = 276618240.

The previous prime is 1260657667. The next prime is 1260657737. The reversal of 1260657720 is 277560621.

1260657720 is a `hidden beast` number, since 1 + 2 + 60 + 6 + 577 + 20 = 666.

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 95 ways as a sum of consecutive naturals, for example, 9069411 + ... + 9069549.

It is an arithmetic number, because the mean of its divisors is an integer number (12694500).

Almost surely, 2^1260657720 is an apocalyptic number.

1260657720 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 1260657720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2437344000).

1260657720 is an abundant number, since it is smaller than the sum of its proper divisors (3614030280).

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

1260657720 is a wasteful number, since it uses less digits than its factorization.

1260657720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 1260657720 is about 35505.7420708257. The cubic root of 1260657720 is about 1080.2701998841.

The spelling of 1260657720 in words is "one billion, two hundred sixty million, six hundred fifty-seven thousand, seven hundred twenty".