51453220 has 96 divisors (see below), whose sum is σ = 140894208. Its totient is φ = 15316992.

The previous prime is 51453217. The next prime is 51453223. The reversal of 51453220 is 2235415.

It is an interprime number because it is at equal distance from previous prime (51453217) and next prime (51453223).

It is a junction number, because it is equal to n+sod(n) for n = 51453191 and 51453200.

It is not an unprimeable number, because it can be changed into a prime (51453223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30109 + ... + 31771.

It is an arithmetic number, because the mean of its divisors is an integer number (1467648).

Almost surely, 2^51453220 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 51453220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70447104).

51453220 is an abundant number, since it is smaller than the sum of its proper divisors (89440988).

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

51453220 is a wasteful number, since it uses less digits than its factorization.

51453220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1709 (or 1707 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 51453220 is about 7173.0899896767. The cubic root of 51453220 is about 371.9382581464.

Adding to 51453220 its reverse (2235415), we get a palindrome (53688635).

The spelling of 51453220 in words is "fifty-one million, four hundred fifty-three thousand, two hundred twenty".