51604644 has 144 divisors (see below), whose sum is σ = 155335488. Its totient is φ = 13208832.

The previous prime is 51604621. The next prime is 51604661. The reversal of 51604644 is 44640615.

51604644 is a modest number, since divided by 4644 gives 516 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 328614 + ... + 328770.

Almost surely, 2^51604644 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 51604644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77667744).

51604644 is an abundant number, since it is smaller than the sum of its proper divisors (103730844).

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

51604644 is a wasteful number, since it uses less digits than its factorization.

51604644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 225 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 51604644 is about 7183.6372402843. The cubic root of 51604644 is about 372.3027654256.

The spelling of 51604644 in words is "fifty-one million, six hundred four thousand, six hundred forty-four".