51804900 has 144 divisors (see below), whose sum is σ = 190404480. Its totient is φ = 11836800.

The previous prime is 51804889. The next prime is 51804913. The reversal of 51804900 is 940815.

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 47 ways as a sum of consecutive naturals, for example, 17530 + ... + 20270.

Almost surely, 2^51804900 is an apocalyptic number.

51804900 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 51804900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95202240).

51804900 is an abundant number, since it is smaller than the sum of its proper divisors (138599580).

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

51804900 is a wasteful number, since it uses less digits than its factorization.

51804900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771 (or 2758 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51804900 is about 7197.5620872626. The cubic root of 51804900 is about 372.7837275005.

The spelling of 51804900 in words is "fifty-one million, eight hundred four thousand, nine hundred".