3561662620 has 24 divisors (see below), whose sum is σ = 7661919888. Its totient is φ = 1389916800.

The previous prime is 3561662597. The next prime is 3561662659. The reversal of 3561662620 is 262661653.

It is a self number, because there is not a number n which added to its sum of digits gives 3561662620.

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, 2170926 + ... + 2172565.

It is an arithmetic number, because the mean of its divisors is an integer number (319246662).

Almost surely, 2^3561662620 is an apocalyptic number.

It is an amenable number.

3561662620 is an abundant number, since it is smaller than the sum of its proper divisors (4100257268).

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

3561662620 is a wasteful number, since it uses less digits than its factorization.

3561662620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4343541 (or 4343539 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 3561662620 is about 59679.6667215895. Note that the first 3 decimals coincide. The cubic root of 3561662620 is about 1527.1590123560.

The spelling of 3561662620 in words is "three billion, five hundred sixty-one million, six hundred sixty-two thousand, six hundred twenty".