51553964 has 48 divisors (see below), whose sum is σ = 114428160. Its totient is φ = 19738560.

The previous prime is 51553963. The next prime is 51553981. The reversal of 51553964 is 46935515.

It is a super-2 number, since 2×51553964² = 5315622408226592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51553963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16754 + ... + 19590.

It is an arithmetic number, because the mean of its divisors is an integer number (2383920).

Almost surely, 2^51553964 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 51553964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57214080).

51553964 is an abundant number, since it is smaller than the sum of its proper divisors (62874196).

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

51553964 is a wasteful number, since it uses less digits than its factorization.

51553964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2918 (or 2916 counting only the distinct ones).

The product of its digits is 81000, while the sum is 38.

The square root of 51553964 is about 7180.1089128230. The cubic root of 51553964 is about 372.1808482053.

It can be divided in two parts, 5155 and 3964, that added together give a palindrome (9119).

The spelling of 51553964 in words is "fifty-one million, five hundred fifty-three thousand, nine hundred sixty-four".