51819456 has 84 divisors (see below), whose sum is σ = 148556472. Its totient is φ = 15934464.

The previous prime is 51819431. The next prime is 51819457. The reversal of 51819456 is 65491815.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51819457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31650 + ... + 33246.

Almost surely, 2^51819456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51819456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74278236).

51819456 is an abundant number, since it is smaller than the sum of its proper divisors (96737016).

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

51819456 is a wasteful number, since it uses less digits than its factorization.

51819456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638 (or 1615 counting only the distinct ones).

The product of its digits is 43200, while the sum is 39.

The square root of 51819456 is about 7198.5731919596. The cubic root of 51819456 is about 372.8186388171.

The spelling of 51819456 in words is "fifty-one million, eight hundred nineteen thousand, four hundred fifty-six".