1647749652 has 12 divisors (see below), whose sum is σ = 3844749216. Its totient is φ = 549249880.

The previous prime is 1647749639. The next prime is 1647749681. The reversal of 1647749652 is 2569477461.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1647749652² = 5430157831332242208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1647749595 and 1647749604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68656224 + ... + 68656247.

It is an arithmetic number, because the mean of its divisors is an integer number (320395768).

Almost surely, 2^1647749652 is an apocalyptic number.

1647749652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1647749652 is an abundant number, since it is smaller than the sum of its proper divisors (2196999564).

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

1647749652 is a wasteful number, since it uses less digits than its factorization.

1647749652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137312478 (or 137312476 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The square root of 1647749652 is about 40592.4827030819. The cubic root of 1647749652 is about 1181.1283021906.

The spelling of 1647749652 in words is "one billion, six hundred forty-seven million, seven hundred forty-nine thousand, six hundred fifty-two".