6440025007 has 8 divisors (see below), whose sum is σ = 6936405840. Its totient is φ = 5943786240.

The previous prime is 6440024993. The next prime is 6440025037. The reversal of 6440025007 is 7005200446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6440025007 - 2⁷ = 6440024879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440025037) 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, 70344 + ... + 133522.

It is an arithmetic number, because the mean of its divisors is an integer number (867050730).

Almost surely, 2^6440025007 is an apocalyptic number.

6440025007 is a deficient number, since it is larger than the sum of its proper divisors (496380833).

6440025007 is a wasteful number, since it uses less digits than its factorization.

6440025007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71033.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 6440025007 is about 80249.7663984139. The cubic root of 6440025007 is about 1860.4979018345.

The spelling of 6440025007 in words is "six billion, four hundred forty million, twenty-five thousand, seven".