1648533640 has 64 divisors (see below), whose sum is σ = 3999164400. Its totient is φ = 607982592.

The previous prime is 1648533599. The next prime is 1648533641. The reversal of 1648533640 is 463358461.

It can be written as a sum of positive squares in 8 ways, for example, as 1227381156 + 421152484 = 35034^2 + 20522^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1648533593 and 1648533602.

It is not an unprimeable number, because it can be changed into a prime (1648533641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 712806 + ... + 715114.

Almost surely, 2^1648533640 is an apocalyptic number.

1648533640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1648533640 is an abundant number, since it is smaller than the sum of its proper divisors (2350630760).

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

1648533640 is a wasteful number, since it uses less digits than its factorization.

1648533640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3706 (or 3702 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 1648533640 is about 40602.1383673323. The cubic root of 1648533640 is about 1181.3155967417.

The spelling of 1648533640 in words is "one billion, six hundred forty-eight million, five hundred thirty-three thousand, six hundred forty".