51550620 has 96 divisors (see below), whose sum is σ = 161796096. Its totient is φ = 12153600.

The previous prime is 51550561. The next prime is 51550621. The reversal of 51550620 is 2605515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550621) 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, 23365 + ... + 25475.

It is an arithmetic number, because the mean of its divisors is an integer number (1685376).

Almost surely, 2^51550620 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 51550620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80898048).

51550620 is an abundant number, since it is smaller than the sum of its proper divisors (110245476).

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

51550620 is a wasteful number, since it uses less digits than its factorization.

51550620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171 (or 2169 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 24.

The square root of 51550620 is about 7179.8760434982. The cubic root of 51550620 is about 372.1728009762.

The spelling of 51550620 in words is "fifty-one million, five hundred fifty thousand, six hundred twenty".