655623400 has 24 divisors (see below), whose sum is σ = 1524324870. Its totient is φ = 262249280.

The previous prime is 655623359. The next prime is 655623413. The reversal of 655623400 is 4326556.

It can be written as a sum of positive squares in 3 ways, for example, as 559700964 + 95922436 = 23658^2 + 9794^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1638859 + ... + 1639258.

Almost surely, 2^655623400 is an apocalyptic number.

It is an amenable number.

655623400 is an abundant number, since it is smaller than the sum of its proper divisors (868701470).

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

655623400 is a wasteful number, since it uses less digits than its factorization.

655623400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3278133 (or 3278124 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 655623400 is about 25605.1440144358. The cubic root of 655623400 is about 868.7299917756.

Adding to 655623400 its reverse (4326556), we get a palindrome (659949956).

The spelling of 655623400 in words is "six hundred fifty-five million, six hundred twenty-three thousand, four hundred".