51821364 has 48 divisors (see below), whose sum is σ = 141413888. Its totient is φ = 14460768.

The previous prime is 51821339. The next prime is 51821381. The reversal of 51821364 is 46312815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3562 + ... + 10785.

Almost surely, 2^51821364 is an apocalyptic number.

It is an amenable number.

51821364 is an abundant number, since it is smaller than the sum of its proper divisors (89592524).

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

51821364 is a wasteful number, since it uses less digits than its factorization.

51821364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14404 (or 14402 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 51821364 is about 7198.7057170022. The cubic root of 51821364 is about 372.8232145067.

The spelling of 51821364 in words is "fifty-one million, eight hundred twenty-one thousand, three hundred sixty-four".