51378750 has 60 divisors (see below), whose sum is σ = 139136712. Its totient is φ = 13698000.

The previous prime is 51378737. The next prime is 51378763. The reversal of 51378750 is 5787315.

51378750 is a `hidden beast` number, since 513 + 78 + 75 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (51378737) and next prime (51378763).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 8967 + ... + 13533.

Almost surely, 2^51378750 is an apocalyptic number.

51378750 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 51378750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69568356).

51378750 is an abundant number, since it is smaller than the sum of its proper divisors (87757962).

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

51378750 is a wasteful number, since it uses less digits than its factorization.

51378750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4595 (or 4577 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 51378750 is about 7167.8971811822. The cubic root of 51378750 is about 371.7587318653.

The spelling of 51378750 in words is "fifty-one million, three hundred seventy-eight thousand, seven hundred fifty".