6491890 has 16 divisors (see below), whose sum is σ = 11846808. Its totient is φ = 2560896.

The previous prime is 6491873. The next prime is 6491893. The reversal of 6491890 is 981946.

It can be written as a sum of positive squares in 4 ways, for example, as 4214809 + 2277081 = 2053^2 + 1509^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491893) 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, 3717 + ... + 5176.

Almost surely, 2^6491890 is an apocalyptic number.

6491890 is a deficient number, since it is larger than the sum of its proper divisors (5354918).

6491890 is a wasteful number, since it uses less digits than its factorization.

6491890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8973.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 6491890 is about 2547.9187585164. The cubic root of 6491890 is about 186.5479084467.

It can be divided in two parts, 6491 and 890, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 6491890 in words is "six million, four hundred ninety-one thousand, eight hundred ninety".