51550464 has 144 divisors (see below), whose sum is σ = 161165312. Its totient is φ = 14321664.

The previous prime is 51550417. The next prime is 51550469. The reversal of 51550464 is 46405515.

It is not an unprimeable number, because it can be changed into a prime (51550469) 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, 231057 + ... + 231279.

Almost surely, 2^51550464 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 51550464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80582656).

51550464 is an abundant number, since it is smaller than the sum of its proper divisors (109614848).

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

51550464 is a wasteful number, since it uses less digits than its factorization.

51550464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 51550464 is about 7179.8651797927. The cubic root of 51550464 is about 372.1724255587.

Adding to 51550464 its reverse (46405515), we get a palindrome (97955979).

The spelling of 51550464 in words is "fifty-one million, five hundred fifty thousand, four hundred sixty-four".