1642601620 has 36 divisors (see below), whose sum is σ = 3791564532. Its totient is φ = 597308800.

The previous prime is 1642601581. The next prime is 1642601663. The reversal of 1642601620 is 261062461.

It can be written as a sum of positive squares in 2 ways, for example, as 566630416 + 1075971204 = 23804^2 + 32802^2 .

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 11 ways as a sum of consecutive naturals, for example, 336961 + ... + 341800.

It is an arithmetic number, because the mean of its divisors is an integer number (105321237).

Almost surely, 2^1642601620 is an apocalyptic number.

1642601620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1642601620 is an abundant number, since it is smaller than the sum of its proper divisors (2148962912).

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

1642601620 is a wasteful number, since it uses less digits than its factorization.

1642601620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678792 (or 678779 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1642601620 is about 40529.0219472417. The cubic root of 1642601620 is about 1179.8969602644.

The spelling of 1642601620 in words is "one billion, six hundred forty-two million, six hundred one thousand, six hundred twenty".