1620533564 has 48 divisors (see below), whose sum is σ = 3123550080. Its totient is φ = 735433920.

The previous prime is 1620533533. The next prime is 1620533567. The reversal of 1620533564 is 4653350261.

It is a super-2 number, since 2×1620533564² = 5252258064101084192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620533567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 534557 + ... + 537579.

It is an arithmetic number, because the mean of its divisors is an integer number (65073960).

Almost surely, 2^1620533564 is an apocalyptic number.

It is an amenable number.

1620533564 is a deficient number, since it is larger than the sum of its proper divisors (1503016516).

1620533564 is a wasteful number, since it uses less digits than its factorization.

1620533564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127 (or 3099 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 1620533564 is about 40255.8513013947. The cubic root of 1620533564 is about 1174.5892184713.

The spelling of 1620533564 in words is "one billion, six hundred twenty million, five hundred thirty-three thousand, five hundred sixty-four".