1620328590 has 32 divisors (see below), whose sum is σ = 4320876960. Its totient is φ = 432087552.

The previous prime is 1620328579. The next prime is 1620328613. The reversal of 1620328590 is 958230261.

1620328590 is a `hidden beast` number, since 1 + 62 + 0 + 3 + 2 + 8 + 590 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3000339 + ... + 3000878.

It is an arithmetic number, because the mean of its divisors is an integer number (135027405).

Almost surely, 2^1620328590 is an apocalyptic number.

1620328590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620328590 is an abundant number, since it is smaller than the sum of its proper divisors (2700548370).

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

1620328590 is a wasteful number, since it uses less digits than its factorization.

1620328590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001233 (or 6001227 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1620328590 is about 40253.3053301216. The cubic root of 1620328590 is about 1174.5396935478.

The spelling of 1620328590 in words is "one billion, six hundred twenty million, three hundred twenty-eight thousand, five hundred ninety".