1620302640 has 320 divisors, whose sum is σ = 5888194560. Its totient is φ = 364216320.

The previous prime is 1620302609. The next prime is 1620302659. The reversal of 1620302640 is 462030261.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1620302640.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3545292 + ... + 3545748.

It is an arithmetic number, because the mean of its divisors is an integer number (18400608).

Almost surely, 2^1620302640 is an apocalyptic number.

1620302640 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 1620302640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2944097280).

1620302640 is an abundant number, since it is smaller than the sum of its proper divisors (4267891920).

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

1620302640 is a wasteful number, since it uses less digits than its factorization.

1620302640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 574 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1620302640 is about 40252.9829950527. The cubic root of 1620302640 is about 1174.5334233242.

The spelling of 1620302640 in words is "one billion, six hundred twenty million, three hundred two thousand, six hundred forty".