1290720684 has 24 divisors (see below), whose sum is σ = 3285471168. Its totient is φ = 391127440.

The previous prime is 1290720677. The next prime is 1290720731. The reversal of 1290720684 is 4860270921.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4888962 + ... + 4889225.

It is an arithmetic number, because the mean of its divisors is an integer number (136894632).

Almost surely, 2^1290720684 is an apocalyptic number.

It is an amenable number.

1290720684 is an abundant number, since it is smaller than the sum of its proper divisors (1994750484).

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

1290720684 is a wasteful number, since it uses less digits than its factorization.

1290720684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778205 (or 9778203 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1290720684 is about 35926.6013421810. The cubic root of 1290720684 is about 1088.7899159723.

The spelling of 1290720684 in words is "one billion, two hundred ninety million, seven hundred twenty thousand, six hundred eighty-four".