1620123512 has 64 divisors (see below), whose sum is σ = 3598948800. Its totient is φ = 668989440.

The previous prime is 1620123499. The next prime is 1620123517. The reversal of 1620123512 is 2153210261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620123517) 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, 1189712 + ... + 1191072.

It is an arithmetic number, because the mean of its divisors is an integer number (56233575).

Almost surely, 2^1620123512 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 1620123512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1799474400).

1620123512 is an abundant number, since it is smaller than the sum of its proper divisors (1978825288).

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

1620123512 is a wasteful number, since it uses less digits than its factorization.

1620123512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2132 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1620123512 is about 40250.7579059078. The cubic root of 1620123512 is about 1174.4901393163.

Adding to 1620123512 its reverse (2153210261), we get a palindrome (3773333773).

The spelling of 1620123512 in words is "one billion, six hundred twenty million, one hundred twenty-three thousand, five hundred twelve".