1264391248 has 10 divisors (see below), whose sum is σ = 2449758074. Its totient is φ = 632195616.

The previous prime is 1264391231. The next prime is 1264391257. The reversal of 1264391248 is 8421934621.

It can be written as a sum of positive squares in only one way, i.e., 1124395024 + 139996224 = 33532^2 + 11832^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1264391248.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39512211 + ... + 39512242.

Almost surely, 2^1264391248 is an apocalyptic number.

It is an amenable number.

1264391248 is a deficient number, since it is larger than the sum of its proper divisors (1185366826).

1264391248 is an equidigital number, since it uses as much as digits as its factorization.

1264391248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79024461 (or 79024455 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 1264391248 is about 35558.2795984283. The cubic root of 1264391248 is about 1081.3355813268.

The spelling of 1264391248 in words is "one billion, two hundred sixty-four million, three hundred ninety-one thousand, two hundred forty-eight".