655774020 has 108 divisors (see below), whose sum is σ = 2186527980. Its totient is φ = 158970240.

The previous prime is 655773971. The next prime is 655774027. The reversal of 655774020 is 20477556.

655774020 is a `hidden beast` number, since 65 + 577 + 4 + 0 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 234457344 + 421316676 = 15312^2 + 20526^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655774027) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6726 + ... + 36834.

Almost surely, 2^655774020 is an apocalyptic number.

655774020 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655774020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1093263990).

655774020 is an abundant number, since it is smaller than the sum of its proper divisors (1530753960).

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

655774020 is a wasteful number, since it uses less digits than its factorization.

655774020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30146 (or 30130 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The square root of 655774020 is about 25608.0850514052. The cubic root of 655774020 is about 868.7965127349.

The spelling of 655774020 in words is "six hundred fifty-five million, seven hundred seventy-four thousand, twenty".