6621040 has 20 divisors (see below), whose sum is σ = 15394104. Its totient is φ = 2648384.

The previous prime is 6621029. The next prime is 6621061. The reversal of 6621040 is 401266.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 6620999 and 6621017.

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, 41302 + ... + 41461.

Almost surely, 2^6621040 is an apocalyptic number.

It is an amenable number.

6621040 is an abundant number, since it is smaller than the sum of its proper divisors (8773064).

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

6621040 is a wasteful number, since it uses less digits than its factorization.

6621040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82776 (or 82770 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 6621040 is about 2573.1381618561. The cubic root of 6621040 is about 187.7768591417.

The spelling of 6621040 in words is "six million, six hundred twenty-one thousand, forty".