7787728398 has 16 divisors (see below), whose sum is σ = 16395217920. Its totient is φ = 2459282616.

The previous prime is 7787728393. The next prime is 7787728453. The reversal of 7787728398 is 8938277877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7787728393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34156590 + ... + 34156817.

It is an arithmetic number, because the mean of its divisors is an integer number (1024701120).

Almost surely, 2^7787728398 is an apocalyptic number.

7787728398 is an abundant number, since it is smaller than the sum of its proper divisors (8607489522).

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

7787728398 is a wasteful number, since it uses less digits than its factorization.

7787728398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68313431.

The product of its digits is 66382848, while the sum is 66.

The square root of 7787728398 is about 88248.1070505198. The cubic root of 7787728398 is about 1982.1518962292.

The spelling of 7787728398 in words is "seven billion, seven hundred eighty-seven million, seven hundred twenty-eight thousand, three hundred ninety-eight".