6445649828390 has 64 divisors (see below), whose sum is σ = 12235478673600. Its totient is φ = 2438032379904.

The previous prime is 6445649828389. The next prime is 6445649828441. The reversal of 6445649828390 is 938289465446.

It is a self number, because there is not a number n which added to its sum of digits gives 6445649828390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251681906 + ... + 251707514.

It is an arithmetic number, because the mean of its divisors is an integer number (191179354275).

Almost surely, 2^{6445649828390} is an apocalyptic number.

6445649828390 is a deficient number, since it is larger than the sum of its proper divisors (5789828845210).

6445649828390 is a wasteful number, since it uses less digits than its factorization.

6445649828390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28041.

The product of its (nonzero) digits is 358318080, while the sum is 68.

The spelling of 6445649828390 in words is "six trillion, four hundred forty-five billion, six hundred forty-nine million, eight hundred twenty-eight thousand, three hundred ninety".