6621025 has 24 divisors (see below), whose sum is σ = 8838720. Its totient is φ = 4904640.

The previous prime is 6620981. The next prime is 6621029. The reversal of 6621025 is 5201266.

It is not a de Polignac number, because 6621025 - 2¹⁷ = 6489953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6620987 and 6621005.

It is not an unprimeable number, because it can be changed into a prime (6621029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25044 + ... + 25306.

It is an arithmetic number, because the mean of its divisors is an integer number (368280).

Almost surely, 2^6621025 is an apocalyptic number.

It is an amenable number.

6621025 is a deficient number, since it is larger than the sum of its proper divisors (2217695).

6621025 is a wasteful number, since it uses less digits than its factorization.

6621025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 6621025 is about 2573.1352471256. The cubic root of 6621025 is about 187.7767173384.

The spelling of 6621025 in words is "six million, six hundred twenty-one thousand, twenty-five".