6440100 has 36 divisors (see below), whose sum is σ = 18634224. Its totient is φ = 1717280.

The previous prime is 6440099. The next prime is 6440113. The reversal of 6440100 is 10446.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 6440100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10434 + ... + 11033.

Almost surely, 2^6440100 is an apocalyptic number.

6440100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6440100 is an abundant number, since it is smaller than the sum of its proper divisors (12194124).

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

6440100 is a wasteful number, since it uses less digits than its factorization.

6440100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21484 (or 21477 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 6440100 is about 2537.7352107736. The cubic root of 6440100 is about 186.0505123534.

Adding to 6440100 its reverse (10446), we get a palindrome (6450546).

The spelling of 6440100 in words is "six million, four hundred forty thousand, one hundred".