7427781312 has 56 divisors (see below), whose sum is σ = 22460199936. Its totient is φ = 2122222848.

The previous prime is 7427781311. The next prime is 7427781323. The reversal of 7427781312 is 2131877247.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (7427781311) 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, 2761968 + ... + 2764655.

Almost surely, 2^7427781312 is an apocalyptic number.

It is an amenable number.

7427781312 is an abundant number, since it is smaller than the sum of its proper divisors (15032418624).

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

7427781312 is a wasteful number, since it uses less digits than its factorization.

7427781312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526645 (or 5526635 counting only the distinct ones).

The product of its digits is 131712, while the sum is 42.

The square root of 7427781312 is about 86184.5769961192. The cubic root of 7427781312 is about 1951.1307325007.

The spelling of 7427781312 in words is "seven billion, four hundred twenty-seven million, seven hundred eighty-one thousand, three hundred twelve".