7739721990 has 384 divisors, whose sum is σ = 28213194240. Its totient is φ = 1484179200.

The previous prime is 7739721959. The next prime is 7739722027. The reversal of 7739721990 is 991279377.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1889845 + ... + 1893935.

It is an arithmetic number, because the mean of its divisors is an integer number (73471860).

Almost surely, 2^7739721990 is an apocalyptic number.

7739721990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7739721990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14106597120).

7739721990 is an abundant number, since it is smaller than the sum of its proper divisors (20473472250).

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

7739721990 is a wasteful number, since it uses less digits than its factorization.

7739721990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4145 (or 4132 counting only the distinct ones).

The product of its (nonzero) digits is 1500282, while the sum is 54.

The square root of 7739721990 is about 87975.6897671169. The cubic root of 7739721990 is about 1978.0705952558.

The spelling of 7739721990 in words is "seven billion, seven hundred thirty-nine million, seven hundred twenty-one thousand, nine hundred ninety".