30997994878 has 8 divisors (see below), whose sum is σ = 47085562080. Its totient is φ = 15302807520.

The previous prime is 30997994857. The next prime is 30997994903. The reversal of 30997994878 is 87849979903.

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 30997994878.

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, 98094763 + ... + 98095078.

It is an arithmetic number, because the mean of its divisors is an integer number (5885695260).

Almost surely, 2^30997994878 is an apocalyptic number.

30997994878 is a deficient number, since it is larger than the sum of its proper divisors (16087567202).

30997994878 is a wasteful number, since it uses less digits than its factorization.

30997994878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196189922.

The product of its (nonzero) digits is 246903552, while the sum is 73.

The spelling of 30997994878 in words is "thirty billion, nine hundred ninety-seven million, nine hundred ninety-four thousand, eight hundred seventy-eight".