6620864 has 14 divisors (see below), whose sum is σ = 13138404. Its totient is φ = 3310400.

The previous prime is 6620863. The next prime is 6620869. The reversal of 6620864 is 4680266.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 6620864.

It is not an unprimeable number, because it can be changed into a prime (6620863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51662 + ... + 51789.

Almost surely, 2^6620864 is an apocalyptic number.

6620864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6620864 is a deficient number, since it is larger than the sum of its proper divisors (6517540).

6620864 is a wasteful number, since it uses less digits than its factorization.

6620864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103463 (or 103453 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 6620864 is about 2573.1039621438. The cubic root of 6620864 is about 187.7751953034.

The spelling of 6620864 in words is "six million, six hundred twenty thousand, eight hundred sixty-four".