7407785988 has 42 divisors (see below), whose sum is σ = 19436554494. Its totient is φ = 2469261024.

The previous prime is 7407785981. The next prime is 7407785993. The reversal of 7407785988 is 8895877047.

It can be written as a sum of positive squares in only one way, i.e., 7390497024 + 17288964 = 85968^2 + 4158^2 .

It is a super-2 number, since 2×7407785988² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7407785981) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 1267281 + ... + 1273112.

It is an arithmetic number, because the mean of its divisors is an integer number (462775107).

Almost surely, 2^7407785988 is an apocalyptic number.

It is an amenable number.

7407785988 is an abundant number, since it is smaller than the sum of its proper divisors (12028768506).

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

7407785988 is a wasteful number, since it uses less digits than its factorization.

7407785988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540415 (or 2540398 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The square root of 7407785988 is about 86068.4959087819. The cubic root of 7407785988 is about 1949.3783675339.

The spelling of 7407785988 in words is "seven billion, four hundred seven million, seven hundred eighty-five thousand, nine hundred eighty-eight".