7287811128 has 96 divisors (see below), whose sum is σ = 21989167200. Its totient is φ = 2165071104.

The previous prime is 7287811121. The next prime is 7287811129. The reversal of 7287811128 is 8211187827.

It is a happy number.

It is a super-2 number, since 2×7287811128² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7287811121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107100 + ... + 161387.

It is an arithmetic number, because the mean of its divisors is an integer number (229053825).

Almost surely, 2^7287811128 is an apocalyptic number.

7287811128 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

7287811128 is an abundant number, since it is smaller than the sum of its proper divisors (14701356072).

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

7287811128 is a wasteful number, since it uses less digits than its factorization.

7287811128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268541 (or 268534 counting only the distinct ones).

The product of its digits is 100352, while the sum is 45.

The square root of 7287811128 is about 85368.6776751286. The cubic root of 7287811128 is about 1938.7971365090.

The spelling of 7287811128 in words is "seven billion, two hundred eighty-seven million, eight hundred eleven thousand, one hundred twenty-eight".