1620346624 has 72 divisors (see below), whose sum is σ = 3577572320. Its totient is φ = 727584768.

The previous prime is 1620346621. The next prime is 1620346633. The reversal of 1620346624 is 4266430261.

It is a self number, because there is not a number n which added to its sum of digits gives 1620346624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620346621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116557 + ... + 129715.

Almost surely, 2^1620346624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620346624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1788786160).

1620346624 is an abundant number, since it is smaller than the sum of its proper divisors (1957225696).

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

1620346624 is a wasteful number, since it uses less digits than its factorization.

1620346624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13225 (or 13211 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 1620346624 is about 40253.5293359477. The cubic root of 1620346624 is about 1174.5440510118.

Adding to 1620346624 its reverse (4266430261), we get a palindrome (5886776885).

The spelling of 1620346624 in words is "one billion, six hundred twenty million, three hundred forty-six thousand, six hundred twenty-four".