1617664820 has 24 divisors (see below), whose sum is σ = 3397917600. Its totient is φ = 646909472.

The previous prime is 1617664787. The next prime is 1617664837. The reversal of 1617664820 is 284667161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111971 + ... + 125589.

It is an arithmetic number, because the mean of its divisors is an integer number (141579900).

Almost surely, 2^1617664820 is an apocalyptic number.

1617664820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1617664820 is an abundant number, since it is smaller than the sum of its proper divisors (1780252780).

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

1617664820 is a wasteful number, since it uses less digits than its factorization.

1617664820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19567 (or 19565 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 1617664820 is about 40220.2041267819. The cubic root of 1617664820 is about 1173.8957048977.

The spelling of 1617664820 in words is "one billion, six hundred seventeen million, six hundred sixty-four thousand, eight hundred twenty".