1264257036 has 216 divisors, whose sum is σ = 3978636480. Its totient is φ = 336498624.

The previous prime is 1264257011. The next prime is 1264257053. The reversal of 1264257036 is 6307524621.

1264257036 is a `hidden beast` number, since 1 + 2 + 642 + 5 + 7 + 0 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 2245291 + ... + 2245853.

Almost surely, 2^1264257036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264257036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1989318240).

1264257036 is an abundant number, since it is smaller than the sum of its proper divisors (2714379444).

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

1264257036 is a wasteful number, since it uses less digits than its factorization.

1264257036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 1264257036 is about 35556.3923366812. The cubic root of 1264257036 is about 1081.2973196082.

The spelling of 1264257036 in words is "one billion, two hundred sixty-four million, two hundred fifty-seven thousand, thirty-six".