6291640 has 16 divisors (see below), whose sum is σ = 14156280. Its totient is φ = 2516640.

The previous prime is 6291619. The next prime is 6291653. The reversal of 6291640 is 461926.

It is a junction number, because it is equal to n+sod(n) for n = 6291599 and 6291608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78606 + ... + 78685.

Almost surely, 2^6291640 is an apocalyptic number.

It is an amenable number.

6291640 is an abundant number, since it is smaller than the sum of its proper divisors (7864640).

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

6291640 is a wasteful number, since it uses less digits than its factorization.

6291640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157302 (or 157298 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 6291640 is about 2508.3141748991. The cubic root of 6291640 is about 184.6097446639.

The spelling of 6291640 in words is "six million, two hundred ninety-one thousand, six hundred forty".