655543770 has 64 divisors (see below), whose sum is σ = 1803098880. Its totient is φ = 149419008.

The previous prime is 655543741. The next prime is 655543787. The reversal of 655543770 is 77345556.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74146 + ... + 82514.

It is an arithmetic number, because the mean of its divisors is an integer number (28173420).

Almost surely, 2^655543770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655543770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (901549440).

655543770 is an abundant number, since it is smaller than the sum of its proper divisors (1147555110).

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

655543770 is a wasteful number, since it uses less digits than its factorization.

655543770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8759.

The product of its (nonzero) digits is 441000, while the sum is 42.

The square root of 655543770 is about 25603.5890062311. The cubic root of 655543770 is about 868.6948192614.

The spelling of 655543770 in words is "six hundred fifty-five million, five hundred forty-three thousand, seven hundred seventy".