7278729984 has 360 divisors, whose sum is σ = 22837898160. Its totient is φ = 2303188992.

The previous prime is 7278729961. The next prime is 7278729989. The reversal of 7278729984 is 4899278727.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (7278729989) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 40663207 + ... + 40663385.

It is an arithmetic number, because the mean of its divisors is an integer number (63438606).

Almost surely, 2^7278729984 is an apocalyptic number.

7278729984 is a gapful number since it is divisible by the number (74) 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 7278729984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11418949080).

7278729984 is an abundant number, since it is smaller than the sum of its proper divisors (15559168176).

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

7278729984 is a wasteful number, since it uses less digits than its factorization.

7278729984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 274 counting only the distinct ones).

The product of its digits is 28449792, while the sum is 63.

The square root of 7278729984 is about 85315.4732976381. The cubic root of 7278729984 is about 1937.9915075973.

The spelling of 7278729984 in words is "seven billion, two hundred seventy-eight million, seven hundred twenty-nine thousand, nine hundred eighty-four".