1247985264 has 20 divisors (see below), whose sum is σ = 3223962056. Its totient is φ = 415995072.

The previous prime is 1247985251. The next prime is 1247985269. The reversal of 1247985264 is 4625897421.

It is a super-2 number, since 2×1247985264² = 3114934438322299392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 25999693 = 1247985264 / (1 + 2 + 4 + 7 + 9 + 8 + 5 + 2 + 6 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247985269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12999799 + ... + 12999894.

Almost surely, 2^1247985264 is an apocalyptic number.

It is an amenable number.

1247985264 is an abundant number, since it is smaller than the sum of its proper divisors (1975976792).

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

1247985264 is a wasteful number, since it uses less digits than its factorization.

1247985264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25999704 (or 25999698 counting only the distinct ones).

The product of its digits is 967680, while the sum is 48.

The square root of 1247985264 is about 35326.8348992660. The cubic root of 1247985264 is about 1076.6382848462.

The spelling of 1247985264 in words is "one billion, two hundred forty-seven million, nine hundred eighty-five thousand, two hundred sixty-four".