51319780 has 12 divisors (see below), whose sum is σ = 107771580. Its totient is φ = 20527904.

The previous prime is 51319771. The next prime is 51319781. The reversal of 51319780 is 8791315.

It is a happy number.

51319780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 27290176 + 24029604 = 5224^2 + 4902^2 .

It is not an unprimeable number, because it can be changed into a prime (51319781) 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 3 ways as a sum of consecutive naturals, for example, 1282975 + ... + 1283014.

It is an arithmetic number, because the mean of its divisors is an integer number (8980965).

Almost surely, 2^51319780 is an apocalyptic number.

It is an amenable number.

51319780 is an abundant number, since it is smaller than the sum of its proper divisors (56451800).

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

51319780 is a wasteful number, since it uses less digits than its factorization.

51319780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2565998 (or 2565996 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 51319780 is about 7163.7825204287. The cubic root of 51319780 is about 371.6164486256.

The spelling of 51319780 in words is "fifty-one million, three hundred nineteen thousand, seven hundred eighty".