51871428 has 60 divisors (see below), whose sum is σ = 154980672. Its totient is φ = 14819760.

The previous prime is 51871381. The next prime is 51871433. The reversal of 51871428 is 82417815.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 51871392 and 51871401.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9168 + ... + 13703.

Almost surely, 2^51871428 is an apocalyptic number.

It is an amenable number.

51871428 is an abundant number, since it is smaller than the sum of its proper divisors (103109244).

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

51871428 is a wasteful number, since it uses less digits than its factorization.

51871428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22894 (or 22883 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 51871428 is about 7202.1821693151. The cubic root of 51871428 is about 372.9432358808.

The spelling of 51871428 in words is "fifty-one million, eight hundred seventy-one thousand, four hundred twenty-eight".