7978670520 has 128 divisors (see below), whose sum is σ = 25962431040. Its totient is φ = 1953628160.

The previous prime is 7978670519. The next prime is 7978670533. The reversal of 7978670520 is 250768797.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35944 + ... + 131336.

Almost surely, 2^7978670520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7978670520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12981215520).

7978670520 is an abundant number, since it is smaller than the sum of its proper divisors (17983760520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7978670520 is a wasteful number, since it uses less digits than its factorization.

7978670520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95465 (or 95461 counting only the distinct ones).

The product of its (nonzero) digits is 1481760, while the sum is 51.

The square root of 7978670520 is about 89323.4040999334. The cubic root of 7978670520 is about 1998.2209613132.

The spelling of 7978670520 in words is "seven billion, nine hundred seventy-eight million, six hundred seventy thousand, five hundred twenty".