1641505620 has 24 divisors (see below), whose sum is σ = 4596215904. Its totient is φ = 437734816.

The previous prime is 1641505609. The next prime is 1641505633. The reversal of 1641505620 is 265051461.

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

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, 13679154 + ... + 13679273.

It is an arithmetic number, because the mean of its divisors is an integer number (191508996).

Almost surely, 2^1641505620 is an apocalyptic number.

1641505620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1641505620 is an abundant number, since it is smaller than the sum of its proper divisors (2954710284).

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

1641505620 is a wasteful number, since it uses less digits than its factorization.

1641505620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27358439 (or 27358437 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 1641505620 is about 40515.4985160000. The cubic root of 1641505620 is about 1179.6344793368.

The spelling of 1641505620 in words is "one billion, six hundred forty-one million, five hundred five thousand, six hundred twenty".