1264775980 has 48 divisors (see below), whose sum is σ = 2984716224. Its totient is φ = 446688000.

The previous prime is 1264775971. The next prime is 1264775987. The reversal of 1264775980 is 895774621.

It is not an unprimeable number, because it can be changed into a prime (1264775987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99771 + ... + 111730.

It is an arithmetic number, because the mean of its divisors is an integer number (62181588).

Almost surely, 2^1264775980 is an apocalyptic number.

1264775980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264775980 is an abundant number, since it is smaller than the sum of its proper divisors (1719940244).

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

1264775980 is a wasteful number, since it uses less digits than its factorization.

1264775980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211546 (or 211544 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 1264775980 is about 35563.6890662372. The cubic root of 1264775980 is about 1081.4452473320.

The spelling of 1264775980 in words is "one billion, two hundred sixty-four million, seven hundred seventy-five thousand, nine hundred eighty".