1620003840 has 704 divisors, whose sum is σ = 6822896640. Its totient is φ = 318504960.

The previous prime is 1620003839. The next prime is 1620003857. The reversal of 1620003840 is 483000261.

It is a happy number.

It is a super-2 number, since 2×1620003840² = 5248824883229491200, which contains 22 as substring.

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 1620003840.

It is a congruent number.

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, 26557410 + ... + 26557470.

Almost surely, 2^1620003840 is an apocalyptic number.

1620003840 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 1620003840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3411448320).

1620003840 is an abundant number, since it is smaller than the sum of its proper divisors (5202892800).

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

1620003840 is a wasteful number, since it uses less digits than its factorization.

1620003840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1620003840 is about 40249.2712977515. The cubic root of 1620003840 is about 1174.4612203186.

The spelling of 1620003840 in words is "one billion, six hundred twenty million, three thousand, eight hundred forty".