6649140 has 24 divisors (see below), whose sum is σ = 18617760. Its totient is φ = 1773088.

The previous prime is 6649127. The next prime is 6649141. The reversal of 6649140 is 419466.

It is a super-2 number, since 2×6649140² = 88422125479200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6649098 and 6649107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649141) 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, 55350 + ... + 55469.

It is an arithmetic number, because the mean of its divisors is an integer number (775740).

Almost surely, 2^6649140 is an apocalyptic number.

6649140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6649140 is an abundant number, since it is smaller than the sum of its proper divisors (11968620).

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

6649140 is a wasteful number, since it uses less digits than its factorization.

6649140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110831 (or 110829 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 6649140 is about 2578.5926394062. The cubic root of 6649140 is about 188.0421287811.

The spelling of 6649140 in words is "six million, six hundred forty-nine thousand, one hundred forty".