51891896 has 64 divisors (see below), whose sum is σ = 115577280. Its totient is φ = 21381120.

The previous prime is 51891883. The next prime is 51891899. The reversal of 51891896 is 69819815.

Its product of digits (155520) is a multiple of the sum of its prime factors (384).

It is a self number, because there is not a number n which added to its sum of digits gives 51891896.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51891899) 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, 222596 + ... + 222828.

It is an arithmetic number, because the mean of its divisors is an integer number (1805895).

Almost surely, 2^51891896 is an apocalyptic number.

51891896 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 51891896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57788640).

51891896 is an abundant number, since it is smaller than the sum of its proper divisors (63685384).

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

51891896 is a wasteful number, since it uses less digits than its factorization.

51891896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384 (or 380 counting only the distinct ones).

The product of its digits is 155520, while the sum is 47.

The square root of 51891896 is about 7203.6029873946. The cubic root of 51891896 is about 372.9922827816.

The spelling of 51891896 in words is "fifty-one million, eight hundred ninety-one thousand, eight hundred ninety-six".