6392640 has 56 divisors (see below), whose sum is σ = 20299680. Its totient is φ = 1704448.

The previous prime is 6392623. The next prime is 6392651. The reversal of 6392640 is 462936.

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

It is a junction number, because it is equal to n+sod(n) for n = 6392598 and 6392607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2370 + ... + 4289.

Almost surely, 2^6392640 is an apocalyptic number.

6392640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6392640 is an abundant number, since it is smaller than the sum of its proper divisors (13907040).

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

6392640 is a wasteful number, since it uses less digits than its factorization.

6392640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6679 (or 6669 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6392640 is about 2528.3670619592. The cubic root of 6392640 is about 185.5923550161.

The spelling of 6392640 in words is "six million, three hundred ninety-two thousand, six hundred forty".