1620136740 has 96 divisors (see below), whose sum is σ = 4628736000. Its totient is φ = 423326592.

The previous prime is 1620136729. The next prime is 1620136769. The reversal of 1620136740 is 476310261.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1620136698 and 1620136707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 657631 + ... + 660089.

It is an arithmetic number, because the mean of its divisors is an integer number (48216000).

Almost surely, 2^1620136740 is an apocalyptic number.

1620136740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620136740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2314368000).

1620136740 is an abundant number, since it is smaller than the sum of its proper divisors (3008599260).

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

1620136740 is a wasteful number, since it uses less digits than its factorization.

1620136740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 1620136740 is about 40250.9222254596. The cubic root of 1620136740 is about 1174.4933358038.

The spelling of 1620136740 in words is "one billion, six hundred twenty million, one hundred thirty-six thousand, seven hundred forty".