1264421644 has 24 divisors (see below), whose sum is σ = 2230834928. Its totient is φ = 627056640.

The previous prime is 1264421621. The next prime is 1264421651. The reversal of 1264421644 is 4461244621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 374524 + ... + 377884.

Almost surely, 2^1264421644 is an apocalyptic number.

It is an amenable number.

1264421644 is a deficient number, since it is larger than the sum of its proper divisors (966413284).

1264421644 is a wasteful number, since it uses less digits than its factorization.

1264421644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105 (or 4103 counting only the distinct ones).

The product of its digits is 36864, while the sum is 34.

The square root of 1264421644 is about 35558.7070068640. The cubic root of 1264421644 is about 1081.3442463696.

The spelling of 1264421644 in words is "one billion, two hundred sixty-four million, four hundred twenty-one thousand, six hundred forty-four".