1620534608 has 120 divisors (see below), whose sum is σ = 3970745856. Its totient is φ = 627137280.

The previous prime is 1620534599. The next prime is 1620534611. The reversal of 1620534608 is 8064350261.

It is a super-2 number, since 2×1620534608² = 5252264831451427328, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2669441 + ... + 2670047.

Almost surely, 2^1620534608 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 1620534608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1985372928).

1620534608 is an abundant number, since it is smaller than the sum of its proper divisors (2350211248).

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

1620534608 is a wasteful number, since it uses less digits than its factorization.

1620534608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 824 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1620534608 is about 40255.8642684516. The cubic root of 1620534608 is about 1174.5894707073.

Adding to 1620534608 its reverse (8064350261), we get a palindrome (9684884869).

It can be divided in two parts, 162053 and 4608, that added together give a palindrome (166661).

The spelling of 1620534608 in words is "one billion, six hundred twenty million, five hundred thirty-four thousand, six hundred eight".