7978210020 has 216 divisors, whose sum is σ = 27587868672. Its totient is φ = 1933968960.

The previous prime is 7978209959. The next prime is 7978210021. The reversal of 7978210020 is 200128797.

7978210020 = 8060² + 8061² + ... + 8180².

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (7978210021) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 581277 + ... + 594843.

Almost surely, 2^7978210020 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 7978210020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13793934336).

7978210020 is an abundant number, since it is smaller than the sum of its proper divisors (19609658652).

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

7978210020 is a wasteful number, since it uses less digits than its factorization.

7978210020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13613 (or 13588 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 7978210020 is about 89320.8263508573. The cubic root of 7978210020 is about 1998.1825172118.

The spelling of 7978210020 in words is "seven billion, nine hundred seventy-eight million, two hundred ten thousand, twenty".