28911970938 has 16 divisors (see below), whose sum is σ = 58396457376. Its totient is φ = 9541904400.

The previous prime is 28911970937. The next prime is 28911970951. The reversal of 28911970938 is 83907911982.

It is not an unprimeable number, because it can be changed into a prime (28911970933) 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, 23854156 + ... + 23855367.

It is an arithmetic number, because the mean of its divisors is an integer number (3649778586).

Almost surely, 2^28911970938 is an apocalyptic number.

28911970938 is an abundant number, since it is smaller than the sum of its proper divisors (29484486438).

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

28911970938 is a wasteful number, since it uses less digits than its factorization.

28911970938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47709629.

The product of its (nonzero) digits is 1959552, while the sum is 57.

The spelling of 28911970938 in words is "twenty-eight billion, nine hundred eleven million, nine hundred seventy thousand, nine hundred thirty-eight".