1650072640 has 28 divisors (see below), whose sum is σ = 3929236236. Its totient is φ = 660028928.

The previous prime is 1650072587. The next prime is 1650072643. The reversal of 1650072640 is 462700561.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 347151424 + 1302921216 = 18632^2 + 36096^2 .

It is not an unprimeable number, because it can be changed into a prime (1650072643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2577919 + ... + 2578558.

Almost surely, 2^1650072640 is an apocalyptic number.

1650072640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1650072640 is an abundant number, since it is smaller than the sum of its proper divisors (2279163596).

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

1650072640 is an equidigital number, since it uses as much as digits as its factorization.

1650072640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156494 (or 5156484 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1650072640 is about 40621.0861499296. The cubic root of 1650072640 is about 1181.6830908595.

The spelling of 1650072640 in words is "one billion, six hundred fifty million, seventy-two thousand, six hundred forty".