51347442420 has 72 divisors (see below), whose sum is σ = 155779401960. Its totient is φ = 13690410240.

The previous prime is 51347442397. The next prime is 51347442437. The reversal of 51347442420 is 2424474315.

It can be written as a sum of positive squares in 4 ways, for example, as 15927449616 + 35419992804 = 126204^2 + 188202^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1281490 + ... + 1320950.

It is an arithmetic number, because the mean of its divisors is an integer number (2163602805).

Almost surely, 2^51347442420 is an apocalyptic number.

It is an amenable number.

51347442420 is an abundant number, since it is smaller than the sum of its proper divisors (104431959540).

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

51347442420 is a wasteful number, since it uses less digits than its factorization.

51347442420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46705 (or 46700 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 36.

The spelling of 51347442420 in words is "fifty-one billion, three hundred forty-seven million, four hundred forty-two thousand, four hundred twenty".