1640812480 has 56 divisors (see below), whose sum is σ = 3924421920. Its totient is φ = 653429760.

The previous prime is 1640812457. The next prime is 1640812487. The reversal of 1640812480 is 842180461.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640812487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62085 + ... + 84475.

Almost surely, 2^1640812480 is an apocalyptic number.

1640812480 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 1640812480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1962210960).

1640812480 is an abundant number, since it is smaller than the sum of its proper divisors (2283609440).

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

1640812480 is a wasteful number, since it uses less digits than its factorization.

1640812480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22637 (or 22627 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 1640812480 is about 40506.9436023011. The cubic root of 1640812480 is about 1179.4684189943.

The spelling of 1640812480 in words is "one billion, six hundred forty million, eight hundred twelve thousand, four hundred eighty".