51009750 has 160 divisors (see below), whose sum is σ = 156293280. Its totient is φ = 12312000.

The previous prime is 51009731. The next prime is 51009769. The reversal of 51009750 is 5790015.

It is an interprime number because it is at equal distance from previous prime (51009731) and next prime (51009769).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 222636 + ... + 222864.

It is an arithmetic number, because the mean of its divisors is an integer number (976833).

Almost surely, 2^51009750 is an apocalyptic number.

51009750 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 51009750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78146640).

51009750 is an abundant number, since it is smaller than the sum of its proper divisors (105283530).

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

51009750 is a wasteful number, since it uses less digits than its factorization.

51009750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 1575, while the sum is 27.

The square root of 51009750 is about 7142.1110324609. Note that the first 3 decimals coincide. The cubic root of 51009750 is about 370.8666075713.

Adding to 51009750 its reverse (5790015), we get a palindrome (56799765).

The spelling of 51009750 in words is "fifty-one million, nine thousand, seven hundred fifty".