30420257638 has 8 divisors (see below), whose sum is σ = 45761133600. Its totient is φ = 15166546440.

The previous prime is 30420257603. The next prime is 30420257641. The reversal of 30420257638 is 83675202403.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 30420257638.

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, 21790318 + ... + 21791713.

It is an arithmetic number, because the mean of its divisors is an integer number (5720141700).

Almost surely, 2^30420257638 is an apocalyptic number.

30420257638 is a deficient number, since it is larger than the sum of its proper divisors (15340875962).

30420257638 is a wasteful number, since it uses less digits than its factorization.

30420257638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43582382.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 30420257638 in words is "thirty billion, four hundred twenty million, two hundred fifty-seven thousand, six hundred thirty-eight".