51920028 has 120 divisors (see below), whose sum is σ = 143678304. Its totient is φ = 16329600.

The previous prime is 51920021. The next prime is 51920041. The reversal of 51920028 is 82002915.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 51919983 and 51920010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51920021) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 731233 + ... + 731303.

Almost surely, 2^51920028 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 51920028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71839152).

51920028 is an abundant number, since it is smaller than the sum of its proper divisors (91758276).

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

51920028 is a wasteful number, since it uses less digits than its factorization.

51920028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185 (or 174 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51920028 is about 7205.5553568063. Note that the first 3 decimals coincide. The cubic root of 51920028 is about 373.0596736724.

The spelling of 51920028 in words is "fifty-one million, nine hundred twenty thousand, twenty-eight".