878465680225 has 81 divisors (see below), whose sum is σ = 1291196487321. Its totient is φ = 591151780800.

The previous prime is 878465680217. The next prime is 878465680229. The reversal of 878465680225 is 522086564878.

The square root of 878465680225 is 937265.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 404637204321 + 473828475904 = 636111^2 + 688352^2 .

It is not a de Polignac number, because 878465680225 - 2³ = 878465680217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (878465680229) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 2001060556 + ... + 2001060994.

Almost surely, 2^878465680225 is an apocalyptic number.

878465680225 is the 937265-th square number.

878465680225 is the 468633-rd centered octagonal number.

It is an amenable number.

878465680225 is a deficient number, since it is larger than the sum of its proper divisors (412730807096).

878465680225 is an frugal number, since it uses more digits than its factorization.

878465680225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 51609600, while the sum is 61.

The spelling of 878465680225 in words is "eight hundred seventy-eight billion, four hundred sixty-five million, six hundred eighty thousand, two hundred twenty-five".