6539778000 has 800 divisors, whose sum is σ = 27712988160. Its totient is φ = 1455667200.

The previous prime is 6539777989. The next prime is 6539778001. The reversal of 6539778000 is 8779356.

It is a happy number.

It is a super-3 number, since 3×6539778000³ (a number of 30 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6539778001) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 82781961 + ... + 82782039.

Almost surely, 2^6539778000 is an apocalyptic number.

6539778000 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 6539778000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13856494080).

6539778000 is an abundant number, since it is smaller than the sum of its proper divisors (21173210160).

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

6539778000 is a wasteful number, since it uses less digits than its factorization.

6539778000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 6539778000 is about 80868.8938962318. The cubic root of 6539778000 is about 1870.0548088447.

The spelling of 6539778000 in words is "six billion, five hundred thirty-nine million, seven hundred seventy-eight thousand".