1640013750 has 80 divisors (see below), whose sum is σ = 4554229680. Its totient is φ = 437328000.

The previous prime is 1640013721. The next prime is 1640013751. The reversal of 1640013750 is 573100461.

1640013750 is a `hidden beast` number, since 1 + 640 + 0 + 13 + 7 + 5 + 0 = 666.

1640013750 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640013751) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 9454 + ... + 58046.

It is an arithmetic number, because the mean of its divisors is an integer number (56927871).

Almost surely, 2^1640013750 is an apocalyptic number.

1640013750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640013750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2277114840).

1640013750 is an abundant number, since it is smaller than the sum of its proper divisors (2914215930).

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

1640013750 is an equidigital number, since it uses as much as digits as its factorization.

1640013750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48624 (or 48603 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1640013750 is about 40497.0832283018. The cubic root of 1640013750 is about 1179.2770037193.

The spelling of 1640013750 in words is "one billion, six hundred forty million, thirteen thousand, seven hundred fifty".