51380028 has 192 divisors, whose sum is σ = 165760000. Its totient is φ = 13716864.

The previous prime is 51380023. The next prime is 51380029. The reversal of 51380028 is 82008315.

It is a happy number.

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

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 51379983 and 51380010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51380023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 703800 + ... + 703872.

Almost surely, 2^51380028 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 51380028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82880000).

51380028 is an abundant number, since it is smaller than the sum of its proper divisors (114379972).

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

51380028 is a wasteful number, since it uses less digits than its factorization.

51380028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 51380028 is about 7167.9863281120. The cubic root of 51380028 is about 371.7618142273.

The spelling of 51380028 in words is "fifty-one million, three hundred eighty thousand, twenty-eight".