1247988728 has 32 divisors (see below), whose sum is σ = 2710904160. Its totient is φ = 527523840.

The previous prime is 1247988727. The next prime is 1247988743. The reversal of 1247988728 is 8278897421.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247988727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148553 + ... + 156728.

It is an arithmetic number, because the mean of its divisors is an integer number (84715755).

Almost surely, 2^1247988728 is an apocalyptic number.

It is an amenable number.

1247988728 is an abundant number, since it is smaller than the sum of its proper divisors (1462915432).

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

1247988728 is a wasteful number, since it uses less digits than its factorization.

1247988728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305367 (or 305363 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 56.

The square root of 1247988728 is about 35326.8839271170. The cubic root of 1247988728 is about 1076.6392809775.

The spelling of 1247988728 in words is "one billion, two hundred forty-seven million, nine hundred eighty-eight thousand, seven hundred twenty-eight".