655689380 has 24 divisors (see below), whose sum is σ = 1378242432. Its totient is φ = 262029152.

The previous prime is 655689319. The next prime is 655689389. The reversal of 655689380 is 83986556.

It is not an unprimeable number, because it can be changed into a prime (655689389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7199 + ... + 36921.

It is an arithmetic number, because the mean of its divisors is an integer number (57426768).

Almost surely, 2^655689380 is an apocalyptic number.

It is an amenable number.

655689380 is an abundant number, since it is smaller than the sum of its proper divisors (722553052).

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

655689380 is a wasteful number, since it uses less digits than its factorization.

655689380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30835 (or 30833 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 655689380 is about 25606.4323950058. The cubic root of 655689380 is about 868.7591329371.

The spelling of 655689380 in words is "six hundred fifty-five million, six hundred eighty-nine thousand, three hundred eighty".