51904420 has 24 divisors (see below), whose sum is σ = 109134648. Its totient is φ = 20736000.

The previous prime is 51904379. The next prime is 51904421. The reversal of 51904420 is 2440915.

It can be written as a sum of positive squares in 4 ways, for example, as 28323684 + 23580736 = 5322^2 + 4856^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51904421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 31210 + ... + 32830.

It is an arithmetic number, because the mean of its divisors is an integer number (4547277).

Almost surely, 2^51904420 is an apocalyptic number.

It is an amenable number.

51904420 is an abundant number, since it is smaller than the sum of its proper divisors (57230228).

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

51904420 is a wasteful number, since it uses less digits than its factorization.

51904420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3231 (or 3229 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 51904420 is about 7204.4722221687. The cubic root of 51904420 is about 373.0222873356.

The spelling of 51904420 in words is "fifty-one million, nine hundred four thousand, four hundred twenty".