1225620660 has 48 divisors (see below), whose sum is σ = 3743716032. Its totient is φ = 297120000.

The previous prime is 1225620659. The next prime is 1225620677. The reversal of 1225620660 is 660265221.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 927841 + ... + 929160.

It is an arithmetic number, because the mean of its divisors is an integer number (77994084).

Almost surely, 2^1225620660 is an apocalyptic number.

1225620660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225620660 is an abundant number, since it is smaller than the sum of its proper divisors (2518095372).

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

1225620660 is a wasteful number, since it uses less digits than its factorization.

1225620660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857024 (or 1857022 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1225620660 is about 35008.8654486260. The cubic root of 1225620660 is about 1070.1681571103.

Adding to 1225620660 its reverse (660265221), we get a palindrome (1885885881).

The spelling of 1225620660 in words is "one billion, two hundred twenty-five million, six hundred twenty thousand, six hundred sixty".