1648665620 has 24 divisors (see below), whose sum is σ = 3956797824. Its totient is φ = 565256736.

The previous prime is 1648665611. The next prime is 1648665649. The reversal of 1648665620 is 265668461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5887952 + ... + 5888231.

It is an arithmetic number, because the mean of its divisors is an integer number (164866576).

Almost surely, 2^1648665620 is an apocalyptic number.

1648665620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1648665620 is an abundant number, since it is smaller than the sum of its proper divisors (2308132204).

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

1648665620 is a wasteful number, since it uses less digits than its factorization.

1648665620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11776199 (or 11776197 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 44.

The square root of 1648665620 is about 40603.7636186598. The cubic root of 1648665620 is about 1181.3471208931.

The spelling of 1648665620 in words is "one billion, six hundred forty-eight million, six hundred sixty-five thousand, six hundred twenty".