6619642380 has 240 divisors, whose sum is σ = 22443494304. Its totient is φ = 1623628800.

The previous prime is 6619642357. The next prime is 6619642423. The reversal of 6619642380 is 832469166.

6619642380 is a `hidden beast` number, since 6 + 61 + 96 + 423 + 80 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 11014080 + ... + 11014680.

Almost surely, 2^6619642380 is an apocalyptic number.

6619642380 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 6619642380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11221747152).

6619642380 is an abundant number, since it is smaller than the sum of its proper divisors (15823851924).

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

6619642380 is a wasteful number, since it uses less digits than its factorization.

6619642380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 1147 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 6619642380 is about 81361.1847258876. The cubic root of 6619642380 is about 1877.6364575114.

The spelling of 6619642380 in words is "six billion, six hundred nineteen million, six hundred forty-two thousand, three hundred eighty".