6400870 has 24 divisors (see below), whose sum is σ = 13403664. Its totient is φ = 2194416.

The previous prime is 6400843. The next prime is 6400873. The reversal of 6400870 is 780046.

It is a super-2 number, since 2×6400870² = 81942273513800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6400873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6042 + ... + 7021.

It is an arithmetic number, because the mean of its divisors is an integer number (558486).

Almost surely, 2^6400870 is an apocalyptic number.

6400870 is an abundant number, since it is smaller than the sum of its proper divisors (7002794).

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

6400870 is a wasteful number, since it uses less digits than its factorization.

6400870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13084 (or 13077 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 6400870 is about 2529.9940711393. The cubic root of 6400870 is about 185.6719658431.

The spelling of 6400870 in words is "six million, four hundred thousand, eight hundred seventy".