1647427428 has 36 divisors (see below), whose sum is σ = 4179721728. Its totient is φ = 547112880.

The previous prime is 1647427421. The next prime is 1647427477. The reversal of 1647427428 is 8247247461.

1647427428 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1647427421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74676 + ... + 94187.

Almost surely, 2^1647427428 is an apocalyptic number.

1647427428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1647427428 is an abundant number, since it is smaller than the sum of its proper divisors (2532294300).

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

1647427428 is a wasteful number, since it uses less digits than its factorization.

1647427428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169144 (or 169139 counting only the distinct ones).

The product of its digits is 602112, while the sum is 45.

The square root of 1647427428 is about 40588.5134982793. The cubic root of 1647427428 is about 1181.0513057252.

The spelling of 1647427428 in words is "one billion, six hundred forty-seven million, four hundred twenty-seven thousand, four hundred twenty-eight".