51380000 has 120 divisors (see below), whose sum is σ = 144853632. Its totient is φ = 17568000.

The previous prime is 51379997. The next prime is 51380023. The reversal of 51380000 is 8315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 139817 + ... + 140183.

Almost surely, 2^51380000 is an apocalyptic number.

51380000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51380000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72426816).

51380000 is an abundant number, since it is smaller than the sum of its proper divisors (93473632).

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

51380000 is an equidigital number, since it uses as much as digits as its factorization.

51380000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404 (or 381 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51380000 is about 7167.9843749830. The cubic root of 51380000 is about 371.7617466956.

Adding to 51380000 its reverse (8315), we get a palindrome (51388315).

The spelling of 51380000 in words is "fifty-one million, three hundred eighty thousand".