6978420540 has 576 divisors, whose sum is σ = 27944017920. Its totient is φ = 1422074880.

The previous prime is 6978420517. The next prime is 6978420569. The reversal of 6978420540 is 450248796.

It is a happy number.

6978420540 is a `hidden beast` number, since 6 + 9 + 7 + 84 + 20 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 13709806 + ... + 13710314.

It is an arithmetic number, because the mean of its divisors is an integer number (48513920).

Almost surely, 2^6978420540 is an apocalyptic number.

6978420540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6978420540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13972008960).

6978420540 is an abundant number, since it is smaller than the sum of its proper divisors (20965597380).

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

6978420540 is a wasteful number, since it uses less digits than its factorization.

6978420540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 6978420540 is about 83536.9411697603. The cubic root of 6978420540 is about 1910.9634440193.

The spelling of 6978420540 in words is "six billion, nine hundred seventy-eight million, four hundred twenty thousand, five hundred forty".