51871800 has 48 divisors (see below), whose sum is σ = 160804440. Its totient is φ = 13832320.

The previous prime is 51871769. The next prime is 51871823. The reversal of 51871800 is 817815.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42627 + ... + 43826.

Almost surely, 2^51871800 is an apocalyptic number.

51871800 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51871800 is an abundant number, since it is smaller than the sum of its proper divisors (108932640).

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

51871800 is a wasteful number, since it uses less digits than its factorization.

51871800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86472 (or 86463 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 30.

The square root of 51871800 is about 7202.2079947749. The cubic root of 51871800 is about 372.9441274092.

The spelling of 51871800 in words is "fifty-one million, eight hundred seventy-one thousand, eight hundred".