1264501440 has 84 divisors (see below), whose sum is σ = 4349367984. Its totient is φ = 337199616.

The previous prime is 1264501397. The next prime is 1264501493. The reversal of 1264501440 is 441054621.

1264501440 is a `hidden beast` number, since 1 + 2 + 645 + 0 + 14 + 4 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 216652 + ... + 222411.

Almost surely, 2^1264501440 is an apocalyptic number.

1264501440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264501440 is an abundant number, since it is smaller than the sum of its proper divisors (3084866544).

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

1264501440 is a wasteful number, since it uses less digits than its factorization.

1264501440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439086 (or 439073 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1264501440 is about 35559.8290209613. The cubic root of 1264501440 is about 1081.3669932992.

The spelling of 1264501440 in words is "one billion, two hundred sixty-four million, five hundred one thousand, four hundred forty".