1620751680 has 336 divisors, whose sum is σ = 6091001280. Its totient is φ = 409079808.

The previous prime is 1620751679. The next prime is 1620751687. The reversal of 1620751680 is 861570261.

1620751680 is a `hidden beast` number, since 1 + 62 + 0 + 7 + 516 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620751687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1476892 + ... + 1477988.

It is an arithmetic number, because the mean of its divisors is an integer number (18127980).

Almost surely, 2^1620751680 is an apocalyptic number.

1620751680 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 1620751680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3045500640).

1620751680 is an abundant number, since it is smaller than the sum of its proper divisors (4470249600).

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

1620751680 is a wasteful number, since it uses less digits than its factorization.

1620751680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 1620751680 is about 40258.5603319344. The cubic root of 1620751680 is about 1174.6419141213.

The spelling of 1620751680 in words is "one billion, six hundred twenty million, seven hundred fifty-one thousand, six hundred eighty".