51552420 has 96 divisors (see below), whose sum is σ = 149700096. Its totient is φ = 13248000.

The previous prime is 51552419. The next prime is 51552421. The reversal of 51552420 is 2425515.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51552419) and next prime (51552421).

It is not an unprimeable number, because it can be changed into a prime (51552421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 284730 + ... + 284910.

It is an arithmetic number, because the mean of its divisors is an integer number (1559376).

Almost surely, 2^51552420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51552420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74850048).

51552420 is an abundant number, since it is smaller than the sum of its proper divisors (98147676).

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

51552420 is a wasteful number, since it uses less digits than its factorization.

51552420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 51552420 is about 7180.0013927575. The cubic root of 51552420 is about 372.1771326619.

Adding to 51552420 its reverse (2425515), we get a palindrome (53977935).

The spelling of 51552420 in words is "fifty-one million, five hundred fifty-two thousand, four hundred twenty".