51520216 has 32 divisors (see below), whose sum is σ = 107179200. Its totient is φ = 23019040.

The previous prime is 51520199. The next prime is 51520219. The reversal of 51520216 is 61202515.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231 + ... + 10153.

It is an arithmetic number, because the mean of its divisors is an integer number (3349350).

Almost surely, 2^51520216 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 51520216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53589600).

51520216 is an abundant number, since it is smaller than the sum of its proper divisors (55658984).

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

51520216 is a wasteful number, since it uses less digits than its factorization.

51520216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9999 (or 9995 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51520216 is about 7177.7584244665. The cubic root of 51520216 is about 372.0996187516.

The spelling of 51520216 in words is "fifty-one million, five hundred twenty thousand, two hundred sixteen".