51949481428 has 24 divisors (see below), whose sum is σ = 97921004552. Its totient is φ = 23972713344.

The previous prime is 51949481417. The next prime is 51949481477. The reversal of 51949481428 is 82418494915.

It can be written as a sum of positive squares in 4 ways, for example, as 10060491204 + 41888990224 = 100302^2 + 204668^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246826 + ... + 405982.

Almost surely, 2^51949481428 is an apocalyptic number.

It is an amenable number.

51949481428 is a deficient number, since it is larger than the sum of its proper divisors (45971523124).

51949481428 is a wasteful number, since it uses less digits than its factorization.

51949481428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165451 (or 165449 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The spelling of 51949481428 in words is "fifty-one billion, nine hundred forty-nine million, four hundred eighty-one thousand, four hundred twenty-eight".