1247130828 has 72 divisors (see below), whose sum is σ = 3194611056. Its totient is φ = 410188800.

The previous prime is 1247130827. The next prime is 1247130851. The reversal of 1247130828 is 8280317421.

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

It is a junction number, because it is equal to n+sod(n) for n = 1247130792 and 1247130801.

It is not an unprimeable number, because it can be changed into a prime (1247130821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1142563 + ... + 1143653.

It is an arithmetic number, because the mean of its divisors is an integer number (44369598).

Almost surely, 2^1247130828 is an apocalyptic number.

1247130828 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1247130828 is an abundant number, since it is smaller than the sum of its proper divisors (1947480228).

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

1247130828 is a wasteful number, since it uses less digits than its factorization.

1247130828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495 (or 1490 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 1247130828 is about 35314.7395289842. The cubic root of 1247130828 is about 1076.3925211188.

The spelling of 1247130828 in words is "one billion, two hundred forty-seven million, one hundred thirty thousand, eight hundred twenty-eight".