30388420642 has 16 divisors (see below), whose sum is σ = 46827281592. Its totient is φ = 14779549440.

The previous prime is 30388420637. The next prime is 30388420649. The reversal of 30388420642 is 24602488303.

It can be written as a sum of positive squares in 4 ways, for example, as 29842217001 + 546203641 = 172749^2 + 23371^2 .

It is a super-2 number, since 2×30388420642² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30388420595 and 30388420604.

It is not an unprimeable number, because it can be changed into a prime (30388420649) 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, 229018 + ... + 336490.

Almost surely, 2^30388420642 is an apocalyptic number.

30388420642 is a deficient number, since it is larger than the sum of its proper divisors (16438860950).

30388420642 is a wasteful number, since it uses less digits than its factorization.

30388420642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111333.

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 30388420642 in words is "thirty billion, three hundred eighty-eight million, four hundred twenty thousand, six hundred forty-two".