1264066520 has 32 divisors (see below), whose sum is σ = 2921022000. Its totient is φ = 491960448.

The previous prime is 1264066519. The next prime is 1264066537. The reversal of 1264066520 is 256604621.

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, 425570 + ... + 428529.

Almost surely, 2^1264066520 is an apocalyptic number.

1264066520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264066520 is an abundant number, since it is smaller than the sum of its proper divisors (1656955480).

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

1264066520 is a wasteful number, since it uses less digits than its factorization.

1264066520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854147 (or 854143 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 1264066520 is about 35553.7131675441. The cubic root of 1264066520 is about 1081.2430018592.

The spelling of 1264066520 in words is "one billion, two hundred sixty-four million, sixty-six thousand, five hundred twenty".