7780805500 has 96 divisors (see below), whose sum is σ = 18380089728. Its totient is φ = 2860416000.

The previous prime is 7780805471. The next prime is 7780805507. The reversal of 7780805500 is 55080877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7780805507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1564017 + ... + 1568983.

It is an arithmetic number, because the mean of its divisors is an integer number (191459268).

Almost surely, 2^7780805500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7780805500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9190044864).

7780805500 is an abundant number, since it is smaller than the sum of its proper divisors (10599284228).

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

7780805500 is a wasteful number, since it uses less digits than its factorization.

7780805500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5240 (or 5228 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 7780805500 is about 88208.8742701096. The cubic root of 7780805500 is about 1981.5643777286.

The spelling of 7780805500 in words is "seven billion, seven hundred eighty million, eight hundred five thousand, five hundred".