3125644640 has 48 divisors (see below), whose sum is σ = 7391176128. Its totient is φ = 1249099776.

The previous prime is 3125644637. The next prime is 3125644649. The reversal of 3125644640 is 464465213.

It is a self number, because there is not a number n which added to its sum of digits gives 3125644640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3125644649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176009 + ... + 192951.

It is an arithmetic number, because the mean of its divisors is an integer number (153982836).

Almost surely, 2^3125644640 is an apocalyptic number.

It is an amenable number.

3125644640 is an abundant number, since it is smaller than the sum of its proper divisors (4265531488).

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

3125644640 is a wasteful number, since it uses less digits than its factorization.

3125644640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18111 (or 18103 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 3125644640 is about 55907.4649756184. The cubic root of 3125644640 is about 1462.1093922637.

The spelling of 3125644640 in words is "three billion, one hundred twenty-five million, six hundred forty-four thousand, six hundred forty".