820651025 has 24 divisors (see below), whose sum is σ = 1031928000. Its totient is φ = 647352000.

The previous prime is 820650967. The next prime is 820651037. The reversal of 820651025 is 520156028.

It is not a de Polignac number, because 820651025 - 2⁸ = 820650769 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 561746 + ... + 563204.

It is an arithmetic number, because the mean of its divisors is an integer number (42997000).

Almost surely, 2^820651025 is an apocalyptic number.

It is an amenable number.

820651025 is a deficient number, since it is larger than the sum of its proper divisors (211276975).

820651025 is a wasteful number, since it uses less digits than its factorization.

820651025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 820651025 is about 28647.0072607943. The cubic root of 820651025 is about 936.2378012591.

The spelling of 820651025 in words is "eight hundred twenty million, six hundred fifty-one thousand, twenty-five".