51616386 has 64 divisors (see below), whose sum is σ = 123638400. Its totient is φ = 15902208.

The previous prime is 51616381. The next prime is 51616391. The reversal of 51616386 is 68361615.

It is a happy number.

51616386 is a `hidden beast` number, since 5 + 1 + 616 + 38 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (51616381) and next prime (51616391).

It is a self number, because there is not a number n which added to its sum of digits gives 51616386.

It is not an unprimeable number, because it can be changed into a prime (51616381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53686 + ... + 54638.

It is an arithmetic number, because the mean of its divisors is an integer number (1931850).

Almost surely, 2^51616386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51616386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61819200).

51616386 is an abundant number, since it is smaller than the sum of its proper divisors (72022014).

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

51616386 is a wasteful number, since it uses less digits than its factorization.

51616386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040 (or 1034 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 51616386 is about 7184.4544678076. The cubic root of 51616386 is about 372.3310009177.

The spelling of 51616386 in words is "fifty-one million, six hundred sixteen thousand, three hundred eighty-six".