51545420 has 24 divisors (see below), whose sum is σ = 108382848. Its totient is φ = 20592000.

The previous prime is 51545419. The next prime is 51545437. The reversal of 51545420 is 2454515.

It is a self number, because there is not a number n which added to its sum of digits gives 51545420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25445 + ... + 27395.

It is an arithmetic number, because the mean of its divisors is an integer number (4515952).

Almost surely, 2^51545420 is an apocalyptic number.

It is an amenable number.

51545420 is an abundant number, since it is smaller than the sum of its proper divisors (56837428).

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

51545420 is a wasteful number, since it uses less digits than its factorization.

51545420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3279 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 51545420 is about 7179.5139111224. The cubic root of 51545420 is about 372.1602866512.

Adding to 51545420 its reverse (2454515), we get a palindrome (53999935).

The spelling of 51545420 in words is "fifty-one million, five hundred forty-five thousand, four hundred twenty".