51994656 has 96 divisors (see below), whose sum is σ = 173335680. Its totient is φ = 14853888.

The previous prime is 51994639. The next prime is 51994661. The reversal of 51994656 is 65649915.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1750 + ... + 10346.

It is an arithmetic number, because the mean of its divisors is an integer number (1805580).

Almost surely, 2^51994656 is an apocalyptic number.

51994656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51994656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86667840).

51994656 is an abundant number, since it is smaller than the sum of its proper divisors (121341024).

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

51994656 is a wasteful number, since it uses less digits than its factorization.

51994656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8623 (or 8609 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 51994656 is about 7210.7320016764. The cubic root of 51994656 is about 373.2383290003.

It can be divided in two parts, 51994 and 656, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 51994656 in words is "fifty-one million, nine hundred ninety-four thousand, six hundred fifty-six".