1264012620 has 216 divisors, whose sum is σ = 4083582384. Its totient is φ = 290366208.

The previous prime is 1264012619. The next prime is 1264012643. The reversal of 1264012620 is 262104621.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 18865827 + ... + 18865893.

It is an arithmetic number, because the mean of its divisors is an integer number (18905474).

Almost surely, 2^1264012620 is an apocalyptic number.

1264012620 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 1264012620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2041791192).

1264012620 is an abundant number, since it is smaller than the sum of its proper divisors (2819569764).

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

1264012620 is a wasteful number, since it uses less digits than its factorization.

1264012620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 1264012620 is about 35552.9551514357. The cubic root of 1264012620 is about 1081.2276335155.

The spelling of 1264012620 in words is "one billion, two hundred sixty-four million, twelve thousand, six hundred twenty".