51630500 has 48 divisors (see below), whose sum is σ = 116433408. Its totient is φ = 19980000.

The previous prime is 51630473. The next prime is 51630539. The reversal of 51630500 is 503615.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13835 + ... + 17165.

It is an arithmetic number, because the mean of its divisors is an integer number (2425696).

Almost surely, 2^51630500 is an apocalyptic number.

51630500 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 51630500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58216704).

51630500 is an abundant number, since it is smaller than the sum of its proper divisors (64802908).

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

51630500 is a wasteful number, since it uses less digits than its factorization.

51630500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3381 (or 3369 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 51630500 is about 7185.4366603568. The cubic root of 51630500 is about 372.3649345916.

The spelling of 51630500 in words is "fifty-one million, six hundred thirty thousand, five hundred".