28949391475 has 6 divisors (see below), whose sum is σ = 35897245460. Its totient is φ = 23159513160.

The previous prime is 28949391473. The next prime is 28949391503. The reversal of 28949391475 is 57419394982.

It is not a de Polignac number, because 28949391475 - 2¹ = 28949391473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28949391473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 578987805 + ... + 578987854.

Almost surely, 2^28949391475 is an apocalyptic number.

28949391475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28949391475 is a deficient number, since it is larger than the sum of its proper divisors (6947853985).

28949391475 is a wasteful number, since it uses less digits than its factorization.

28949391475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157975669 (or 1157975664 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 61.

The spelling of 28949391475 in words is "twenty-eight billion, nine hundred forty-nine million, three hundred ninety-one thousand, four hundred seventy-five".