1264478320 has 60 divisors (see below), whose sum is σ = 3419908344. Its totient is φ = 433534080.

The previous prime is 1264478317. The next prime is 1264478321. The reversal of 1264478320 is 238744621.

It is a self number, because there is not a number n which added to its sum of digits gives 1264478320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264478321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157366 + ... + 165205.

Almost surely, 2^1264478320 is an apocalyptic number.

1264478320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264478320 is an abundant number, since it is smaller than the sum of its proper divisors (2155430024).

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

1264478320 is a wasteful number, since it uses less digits than its factorization.

1264478320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322598 (or 322585 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 1264478320 is about 35559.5039335478. The cubic root of 1264478320 is about 1081.3604027288.

The spelling of 1264478320 in words is "one billion, two hundred sixty-four million, four hundred seventy-eight thousand, three hundred twenty".