30023071978 has 4 divisors (see below), whose sum is σ = 45034607970. Its totient is φ = 15011535988.

The previous prime is 30023071973. The next prime is 30023071979. The reversal of 30023071978 is 87917032003.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29195531689 + 827540289 = 170867^2 + 28767^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30023071978.

It is not an unprimeable number, because it can be changed into a prime (30023071973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7505767993 + ... + 7505767996.

Almost surely, 2^30023071978 is an apocalyptic number.

30023071978 is a deficient number, since it is larger than the sum of its proper divisors (15011535992).

30023071978 is a wasteful number, since it uses less digits than its factorization.

30023071978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15011535991.

The product of its (nonzero) digits is 63504, while the sum is 40.

The spelling of 30023071978 in words is "thirty billion, twenty-three million, seventy-one thousand, nine hundred seventy-eight".