7826821625 has 16 divisors (see below), whose sum is σ = 11163285120. Its totient is φ = 5366962800.

The previous prime is 7826821543. The next prime is 7826821633. The reversal of 7826821625 is 5261286287.

It is not a de Polignac number, because 7826821625 - 2¹⁰ = 7826820601 is a prime.

It is a super-2 number, since 2×7826821625² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7826821625.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4471595 + ... + 4473344.

It is an arithmetic number, because the mean of its divisors is an integer number (697705320).

Almost surely, 2^7826821625 is an apocalyptic number.

It is an amenable number.

7826821625 is a deficient number, since it is larger than the sum of its proper divisors (3336463495).

7826821625 is an equidigital number, since it uses as much as digits as its factorization.

7826821625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8944961 (or 8944951 counting only the distinct ones).

The product of its digits is 645120, while the sum is 47.

The square root of 7826821625 is about 88469.3258988673. The cubic root of 7826821625 is about 1985.4630634869.

The spelling of 7826821625 in words is "seven billion, eight hundred twenty-six million, eight hundred twenty-one thousand, six hundred twenty-five".