7978898745 has 48 divisors (see below), whose sum is σ = 14709606912. Its totient is φ = 3987048960.

The previous prime is 7978898717. The next prime is 7978898777. The reversal of 7978898745 is 5478988797.

It is not a de Polignac number, because 7978898745 - 2⁵ = 7978898713 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147210 + ... + 193980.

It is an arithmetic number, because the mean of its divisors is an integer number (306450144).

Almost surely, 2^7978898745 is an apocalyptic number.

It is an amenable number.

7978898745 is a deficient number, since it is larger than the sum of its proper divisors (6730708167).

7978898745 is a wasteful number, since it uses less digits than its factorization.

7978898745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47022 (or 47019 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 72.

The square root of 7978898745 is about 89324.6816115233. The cubic root of 7978898745 is about 1998.2400137619.

The spelling of 7978898745 in words is "seven billion, nine hundred seventy-eight million, eight hundred ninety-eight thousand, seven hundred forty-five".