1264857644 has 6 divisors (see below), whose sum is σ = 2213500884. Its totient is φ = 632428820.

The previous prime is 1264857623. The next prime is 1264857661. The reversal of 1264857644 is 4467584621.

It is a happy 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, 158107202 + ... + 158107209.

It is an arithmetic number, because the mean of its divisors is an integer number (368916814).

Almost surely, 2^1264857644 is an apocalyptic number.

It is an amenable number.

1264857644 is a deficient number, since it is larger than the sum of its proper divisors (948643240).

1264857644 is a wasteful number, since it uses less digits than its factorization.

1264857644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316214415 (or 316214413 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 47.

The square root of 1264857644 is about 35564.8371850624. The cubic root of 1264857644 is about 1081.4685224008.

The spelling of 1264857644 in words is "one billion, two hundred sixty-four million, eight hundred fifty-seven thousand, six hundred forty-four".