1205620656 has 40 divisors (see below), whose sum is σ = 3116389824. Its totient is φ = 401632320.

The previous prime is 1205620649. The next prime is 1205620657. The reversal of 1205620656 is 6560265021.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1205620657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84951 + ... + 98121.

Almost surely, 2^1205620656 is an apocalyptic number.

1205620656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1205620656 is an abundant number, since it is smaller than the sum of its proper divisors (1910769168).

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

1205620656 is a wasteful number, since it uses less digits than its factorization.

1205620656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15089 (or 15083 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1205620656 is about 34722.0485570768. The cubic root of 1205620656 is about 1064.3151072662.

Adding to 1205620656 its reverse (6560265021), we get a palindrome (7765885677).

The spelling of 1205620656 in words is "one billion, two hundred five million, six hundred twenty thousand, six hundred fifty-six".