1264592640 has 72 divisors (see below), whose sum is σ = 4038805008. Its totient is φ = 337223680.

The previous prime is 1264592621. The next prime is 1264592689. The reversal of 1264592640 is 462954621.

It is a happy number.

It is a congruent number.

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, 160821 + ... + 168500.

It is an arithmetic number, because the mean of its divisors is an integer number (56094514).

Almost surely, 2^1264592640 is an apocalyptic number.

1264592640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264592640 is an abundant number, since it is smaller than the sum of its proper divisors (2774212368).

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

1264592640 is an equidigital number, since it uses as much as digits as its factorization.

1264592640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329345 (or 329331 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 1264592640 is about 35561.1113437137. Note that the first 3 decimals coincide. The cubic root of 1264592640 is about 1081.3929899215.

The spelling of 1264592640 in words is "one billion, two hundred sixty-four million, five hundred ninety-two thousand, six hundred forty".