1264215550 has 48 divisors (see below), whose sum is σ = 2558554992. Its totient is φ = 461952000.

The previous prime is 1264215527. The next prime is 1264215569. The reversal of 1264215550 is 555124621.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53025 + ... + 73075.

It is an arithmetic number, because the mean of its divisors is an integer number (53303229).

Almost surely, 2^1264215550 is an apocalyptic number.

1264215550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1264215550 is an abundant number, since it is smaller than the sum of its proper divisors (1294339442).

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

1264215550 is a wasteful number, since it uses less digits than its factorization.

1264215550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20173 (or 20168 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1264215550 is about 35555.8089487499. The cubic root of 1264215550 is about 1081.2854920578.

The spelling of 1264215550 in words is "one billion, two hundred sixty-four million, two hundred fifteen thousand, five hundred fifty".