6890640 has 40 divisors (see below), whose sum is σ = 21361728. Its totient is φ = 1837440.

The previous prime is 6890633. The next prime is 6890641. The reversal of 6890640 is 460986.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (6890641) 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, 14116 + ... + 14595.

Almost surely, 2^6890640 is an apocalyptic number.

6890640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6890640 is an abundant number, since it is smaller than the sum of its proper divisors (14471088).

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

6890640 is a wasteful number, since it uses less digits than its factorization.

6890640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28727 (or 28721 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 6890640 is about 2625.0028571413. The cubic root of 6890640 is about 190.2917033555.

The spelling of 6890640 in words is "six million, eight hundred ninety thousand, six hundred forty".