1260661620 has 48 divisors (see below), whose sum is σ = 3534830208. Its totient is φ = 335702400.

The previous prime is 1260661607. The next prime is 1260661643. The reversal of 1260661620 is 261660621.

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, 29170 + ... + 58070.

It is an arithmetic number, because the mean of its divisors is an integer number (73642296).

Almost surely, 2^1260661620 is an apocalyptic number.

1260661620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1260661620 is an abundant number, since it is smaller than the sum of its proper divisors (2274168588).

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

1260661620 is a wasteful number, since it uses less digits than its factorization.

1260661620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29640 (or 29638 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 1260661620 is about 35505.7969914773. The cubic root of 1260661620 is about 1080.2713138659.

Subtracting from 1260661620 its reverse (261660621), we obtain a palindrome (999000999).

The spelling of 1260661620 in words is "one billion, two hundred sixty million, six hundred sixty-one thousand, six hundred twenty".