1620386560 has 72 divisors (see below), whose sum is σ = 4179939120. Its totient is φ = 598290432.

The previous prime is 1620386539. The next prime is 1620386591. The reversal of 1620386560 is 656830261.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32050 + ... + 65329.

It is an arithmetic number, because the mean of its divisors is an integer number (58054710).

Almost surely, 2^1620386560 is an apocalyptic number.

1620386560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620386560 is an abundant number, since it is smaller than the sum of its proper divisors (2559552560).

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

1620386560 is an equidigital number, since it uses as much as digits as its factorization.

1620386560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97413 (or 97399 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 1620386560 is about 40254.0253887732. The cubic root of 1620386560 is about 1174.5537004298.

The spelling of 1620386560 in words is "one billion, six hundred twenty million, three hundred eighty-six thousand, five hundred sixty".