1245657864 has 128 divisors (see below), whose sum is σ = 3611018880. Its totient is φ = 353894400.

The previous prime is 1245657817. The next prime is 1245657869. The reversal of 1245657864 is 4687565421.

It is not an unprimeable number, because it can be changed into a prime (1245657869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1942984 + ... + 1943624.

It is an arithmetic number, because the mean of its divisors is an integer number (28211085).

Almost surely, 2^1245657864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1245657864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1805509440).

1245657864 is an abundant number, since it is smaller than the sum of its proper divisors (2365361016).

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

1245657864 is a wasteful number, since it uses less digits than its factorization.

1245657864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111 (or 1107 counting only the distinct ones).

The product of its digits is 1612800, while the sum is 48.

The square root of 1245657864 is about 35293.8785627196. The cubic root of 1245657864 is about 1075.9685848311.

The spelling of 1245657864 in words is "one billion, two hundred forty-five million, six hundred fifty-seven thousand, eight hundred sixty-four".