1620445086 has 48 divisors (see below), whose sum is σ = 3814561296. Its totient is φ = 494178048.

The previous prime is 1620445061. The next prime is 1620445087. The reversal of 1620445086 is 6805440261.

It is a self number, because there is not a number n which added to its sum of digits gives 1620445086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620445087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4200 + ... + 57083.

It is an arithmetic number, because the mean of its divisors is an integer number (79470027).

Almost surely, 2^1620445086 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620445086, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1907280648).

1620445086 is an abundant number, since it is smaller than the sum of its proper divisors (2194116210).

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

1620445086 is a wasteful number, since it uses less digits than its factorization.

1620445086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61417 (or 61414 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1620445086 is about 40254.7523405622. The cubic root of 1620445086 is about 1174.5678413153.

The spelling of 1620445086 in words is "one billion, six hundred twenty million, four hundred forty-five thousand, eighty-six".