1264132720 has 80 divisors (see below), whose sum is σ = 2999808000. Its totient is φ = 495316224.

The previous prime is 1264132711. The next prime is 1264132721. The reversal of 1264132720 is 272314621.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264132721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877761 + ... + 879199.

It is an arithmetic number, because the mean of its divisors is an integer number (37497600).

Almost surely, 2^1264132720 is an apocalyptic number.

1264132720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264132720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499904000).

1264132720 is an abundant number, since it is smaller than the sum of its proper divisors (1735675280).

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

1264132720 is a wasteful number, since it uses less digits than its factorization.

1264132720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670 (or 1664 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1264132720 is about 35554.6441410964. The cubic root of 1264132720 is about 1081.2618766669.

The spelling of 1264132720 in words is "one billion, two hundred sixty-four million, one hundred thirty-two thousand, seven hundred twenty".