51904818 has 60 divisors (see below), whose sum is σ = 131305278. Its totient is φ = 14817600.

The previous prime is 51904807. The next prime is 51904829. The reversal of 51904818 is 81840915.

It is an interprime number because it is at equal distance from previous prime (51904807) and next prime (51904829).

It can be written as a sum of positive squares in only one way, i.e., 51883209 + 21609 = 7203^2 + 147^2 .

It is a super-2 number, since 2×51904818² = 5388220263226248, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 42618 + ... + 43818.

Almost surely, 2^51904818 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51904818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65652639).

51904818 is an abundant number, since it is smaller than the sum of its proper divisors (79400460).

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

51904818 is a wasteful number, since it uses less digits than its factorization.

51904818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237 (or 1213 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 51904818 is about 7204.4998438476. The cubic root of 51904818 is about 373.0232407707.

The spelling of 51904818 in words is "fifty-one million, nine hundred four thousand, eight hundred eighteen".