1295720640 has 336 divisors, whose sum is σ = 4808134656. Its totient is φ = 319334400.

The previous prime is 1295720597. The next prime is 1295720707. The reversal of 1295720640 is 460275921.

1295720640 is a `hidden beast` number, since 1 + 2 + 9 + 5 + 7 + 2 + 0 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1295720595 and 1295720604.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2053125 + ... + 2053755.

Almost surely, 2^1295720640 is an apocalyptic number.

1295720640 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 1295720640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2404067328).

1295720640 is an abundant number, since it is smaller than the sum of its proper divisors (3512414016).

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

1295720640 is a wasteful number, since it uses less digits than its factorization.

1295720640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1295720640 is about 35996.1197908886. The cubic root of 1295720640 is about 1090.1940119821.

The spelling of 1295720640 in words is "one billion, two hundred ninety-five million, seven hundred twenty thousand, six hundred forty".