51345420 has 48 divisors (see below), whose sum is σ = 164306688. Its totient is φ = 11736000.

The previous prime is 51345419. The next prime is 51345421. The reversal of 51345420 is 2454315.

It is an interprime number because it is at equal distance from previous prime (51345419) and next prime (51345421).

It is not an unprimeable number, because it can be changed into a prime (51345421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60706 + ... + 61545.

It is an arithmetic number, because the mean of its divisors is an integer number (3423056).

Almost surely, 2^51345420 is an apocalyptic number.

It is an amenable number.

51345420 is an abundant number, since it is smaller than the sum of its proper divisors (112961268).

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

51345420 is a wasteful number, since it uses less digits than its factorization.

51345420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122270 (or 122268 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 51345420 is about 7165.5718543603. The cubic root of 51345420 is about 371.6783263874.

Adding to 51345420 its reverse (2454315), we get a palindrome (53799735).

The spelling of 51345420 in words is "fifty-one million, three hundred forty-five thousand, four hundred twenty".