51601638 has 32 divisors (see below), whose sum is σ = 113196672. Its totient is φ = 15552000.

The previous prime is 51601633. The next prime is 51601651. The reversal of 51601638 is 83610615.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51601633) 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, 10713 + ... + 14763.

It is an arithmetic number, because the mean of its divisors is an integer number (3537396).

Almost surely, 2^51601638 is an apocalyptic number.

51601638 is an abundant number, since it is smaller than the sum of its proper divisors (61595034).

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

51601638 is a wasteful number, since it uses less digits than its factorization.

51601638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 51601638 is about 7183.4280117504. The cubic root of 51601638 is about 372.2955363357.

The spelling of 51601638 in words is "fifty-one million, six hundred one thousand, six hundred thirty-eight".