51649224 has 64 divisors (see below), whose sum is σ = 145428480. Its totient is φ = 15144000.

The previous prime is 51649223. The next prime is 51649229. The reversal of 51649224 is 42294615.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (51649223) 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, 5029 + ... + 11339.

It is an arithmetic number, because the mean of its divisors is an integer number (2272320).

Almost surely, 2^51649224 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 51649224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72714240).

51649224 is an abundant number, since it is smaller than the sum of its proper divisors (93779256).

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

51649224 is a wasteful number, since it uses less digits than its factorization.

51649224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6362 (or 6358 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 51649224 is about 7186.7394554137. The cubic root of 51649224 is about 372.4099423446.

The spelling of 51649224 in words is "fifty-one million, six hundred forty-nine thousand, two hundred twenty-four".