51621792 has 96 divisors (see below), whose sum is σ = 146748672. Its totient is φ = 15826944.

The previous prime is 51621781. The next prime is 51621793. The reversal of 51621792 is 29712615.

51621792 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (51621793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76368 + ... + 77040.

It is an arithmetic number, because the mean of its divisors is an integer number (1528632).

Almost surely, 2^51621792 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 51621792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73374336).

51621792 is an abundant number, since it is smaller than the sum of its proper divisors (95126880).

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

51621792 is a wasteful number, since it uses less digits than its factorization.

51621792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 742 counting only the distinct ones).

The product of its digits is 7560, while the sum is 33.

The square root of 51621792 is about 7184.8306869404. The cubic root of 51621792 is about 372.3439990583.

The spelling of 51621792 in words is "fifty-one million, six hundred twenty-one thousand, seven hundred ninety-two".