820980625 has 10 divisors (see below), whose sum is σ = 1025898170. Its totient is φ = 656784000.

The previous prime is 820980623. The next prime is 820980637. The reversal of 820980625 is 526089028.

It can be written as a sum of positive squares in 5 ways, for example, as 501715201 + 319265424 = 22399^2 + 17868^2 .

It is not a de Polignac number, because 820980625 - 2¹ = 820980623 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820980623) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 656160 + ... + 657409.

It is an arithmetic number, because the mean of its divisors is an integer number (102589817).

Almost surely, 2^820980625 is an apocalyptic number.

It is an amenable number.

820980625 is a deficient number, since it is larger than the sum of its proper divisors (204917545).

820980625 is an equidigital number, since it uses as much as digits as its factorization.

820980625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313589 (or 1313574 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 820980625 is about 28652.7594657129. The cubic root of 820980625 is about 936.3631256121.

The spelling of 820980625 in words is "eight hundred twenty million, nine hundred eighty thousand, six hundred twenty-five".