747128840 has 16 divisors (see below), whose sum is σ = 1681039980. Its totient is φ = 298851520.

The previous prime is 747128839. The next prime is 747128881. The reversal of 747128840 is 48821747.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 743434756 + 3694084 = 27266^2 + 1922^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9339071 + ... + 9339150.

Almost surely, 2^747128840 is an apocalyptic number.

It is an amenable number.

747128840 is an abundant number, since it is smaller than the sum of its proper divisors (933911140).

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

747128840 is a wasteful number, since it uses less digits than its factorization.

747128840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18678232 (or 18678228 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 41.

The square root of 747128840 is about 27333.6576403525. The cubic root of 747128840 is about 907.3994262536.

The spelling of 747128840 in words is "seven hundred forty-seven million, one hundred twenty-eight thousand, eight hundred forty".