1640764320 has 192 divisors, whose sum is σ = 5758542720. Its totient is φ = 389910528.

The previous prime is 1640764303. The next prime is 1640764343. The reversal of 1640764320 is 234670461.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176427 + ... + 185493.

It is an arithmetic number, because the mean of its divisors is an integer number (29992410).

Almost surely, 2^1640764320 is an apocalyptic number.

1640764320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640764320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879271360).

1640764320 is an abundant number, since it is smaller than the sum of its proper divisors (4117778400).

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

1640764320 is a wasteful number, since it uses less digits than its factorization.

1640764320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9127 (or 9119 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 1640764320 is about 40506.3491319571. The cubic root of 1640764320 is about 1179.4568792326.

The spelling of 1640764320 in words is "one billion, six hundred forty million, seven hundred sixty-four thousand, three hundred twenty".