7809868125 has 140 divisors (see below), whose sum is σ = 14924919372. Its totient is φ = 4082400000.

The previous prime is 7809868117. The next prime is 7809868133. The reversal of 7809868125 is 5218689087.

It is an interprime number because it is at equal distance from previous prime (7809868117) and next prime (7809868133).

It can be written as a sum of positive squares in 10 ways, for example, as 7173920601 + 635947524 = 84699^2 + 25218^2 .

It is not a de Polignac number, because 7809868125 - 2³ = 7809868117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 139 ways as a sum of consecutive naturals, for example, 27792985 + ... + 27793265.

Almost surely, 2^7809868125 is an apocalyptic number.

7809868125 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7809868125 is a deficient number, since it is larger than the sum of its proper divisors (7115051247).

7809868125 is an frugal number, since it uses more digits than its factorization.

7809868125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The square root of 7809868125 is about 88373.4582609507. The cubic root of 7809868125 is about 1984.0284717402.

The spelling of 7809868125 in words is "seven billion, eight hundred nine million, eight hundred sixty-eight thousand, one hundred twenty-five".