1247788788 has 12 divisors (see below), whose sum is σ = 2911507200. Its totient is φ = 415929592.

The previous prime is 1247788769. The next prime is 1247788799. The reversal of 1247788788 is 8878877421.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×1247788788³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51991188 + ... + 51991211.

It is an arithmetic number, because the mean of its divisors is an integer number (242625600).

Almost surely, 2^1247788788 is an apocalyptic number.

It is an amenable number.

1247788788 is an abundant number, since it is smaller than the sum of its proper divisors (1663718412).

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

1247788788 is a wasteful number, since it uses less digits than its factorization.

1247788788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103982406 (or 103982404 counting only the distinct ones).

The product of its digits is 11239424, while the sum is 60.

The square root of 1247788788 is about 35324.0539576080. The cubic root of 1247788788 is about 1076.5817818592.

The spelling of 1247788788 in words is "one billion, two hundred forty-seven million, seven hundred eighty-eight thousand, seven hundred eighty-eight".