7887621840 has 320 divisors, whose sum is σ = 30169497600. Its totient is φ = 1664796672.

The previous prime is 7887621839. The next prime is 7887621871. The reversal of 7887621840 is 481267887.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1117041 + ... + 1124079.

It is an arithmetic number, because the mean of its divisors is an integer number (94279680).

Almost surely, 2^7887621840 is an apocalyptic number.

7887621840 is a gapful number since it is divisible by the number (70) 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 7887621840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15084748800).

7887621840 is an abundant number, since it is smaller than the sum of its proper divisors (22281875760).

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

7887621840 is a wasteful number, since it uses less digits than its factorization.

7887621840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7114 (or 7108 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 51.

The square root of 7887621840 is about 88812.2842854523. The cubic root of 7887621840 is about 1990.5909577102.

The spelling of 7887621840 in words is "seven billion, eight hundred eighty-seven million, six hundred twenty-one thousand, eight hundred forty".