6731920 has 40 divisors (see below), whose sum is σ = 16858296. Its totient is φ = 2485248.

The previous prime is 6731903. The next prime is 6731927. The reversal of 6731920 is 291376.

It can be written as a sum of positive squares in 4 ways, for example, as 13456 + 6718464 = 116^2 + 2592^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6731927) 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, 2197 + ... + 4276.

Almost surely, 2^6731920 is an apocalyptic number.

It is an amenable number.

6731920 is an abundant number, since it is smaller than the sum of its proper divisors (10126376).

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

6731920 is a wasteful number, since it uses less digits than its factorization.

6731920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499 (or 6493 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 6731920 is about 2594.5943806306. The cubic root of 6731920 is about 188.8192705122.

The spelling of 6731920 in words is "six million, seven hundred thirty-one thousand, nine hundred twenty".