646020825 has 24 divisors (see below), whose sum is σ = 1130918688. Its totient is φ = 324276480.

The previous prime is 646020787. The next prime is 646020827. The reversal of 646020825 is 528020646.

It is not a de Polignac number, because 646020825 - 2⁸ = 646020569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646020827) 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, 252067 + ... + 254616.

It is an arithmetic number, because the mean of its divisors is an integer number (47121612).

Almost surely, 2^646020825 is an apocalyptic number.

It is an amenable number.

646020825 is a deficient number, since it is larger than the sum of its proper divisors (484897863).

646020825 is a wasteful number, since it uses less digits than its factorization.

646020825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506713 (or 506708 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 646020825 is about 25416.9397253092. The cubic root of 646020825 is about 864.4678362129.

The spelling of 646020825 in words is "six hundred forty-six million, twenty thousand, eight hundred twenty-five".