1264820988 has 12 divisors (see below), whose sum is σ = 2951249000. Its totient is φ = 421606992.

The previous prime is 1264820983. The next prime is 1264821007. The reversal of 1264820988 is 8890284621.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1264820988² = 3199544263370592288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264820983) 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 3 ways as a sum of consecutive naturals, for example, 52700863 + ... + 52700886.

Almost surely, 2^1264820988 is an apocalyptic number.

It is an amenable number.

1264820988 is an abundant number, since it is smaller than the sum of its proper divisors (1686428012).

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

1264820988 is a wasteful number, since it uses less digits than its factorization.

1264820988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105401756 (or 105401754 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 1264820988 is about 35564.3218408562. The cubic root of 1264820988 is about 1081.4580751927.

The spelling of 1264820988 in words is "one billion, two hundred sixty-four million, eight hundred twenty thousand, nine hundred eighty-eight".