6444625380 has 48 divisors (see below), whose sum is σ = 18056787840. Its totient is φ = 1717439488.

The previous prime is 6444625373. The next prime is 6444625403. The reversal of 6444625380 is 835264446.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59092 + ... + 127988.

It is an arithmetic number, because the mean of its divisors is an integer number (376183080).

Almost surely, 2^6444625380 is an apocalyptic number.

6444625380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6444625380 is an abundant number, since it is smaller than the sum of its proper divisors (11612162460).

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

6444625380 is a wasteful number, since it uses less digits than its factorization.

6444625380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70468 (or 70466 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 42.

The square root of 6444625380 is about 80278.4241250412. The cubic root of 6444625380 is about 1860.9408062799.

The spelling of 6444625380 in words is "six billion, four hundred forty-four million, six hundred twenty-five thousand, three hundred eighty".