51423742890 has 128 divisors (see below), whose sum is σ = 147756913920. Its totient is φ = 12651427584.

The previous prime is 51423742889. The next prime is 51423742891. The reversal of 51423742890 is 9824732415.

51423742890 is a `hidden beast` number, since 51 + 423 + 74 + 28 + 90 = 666.

51423742890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51423742889) and next prime (51423742891).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51423742891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11184072 + ... + 11188668.

It is an arithmetic number, because the mean of its divisors is an integer number (1154350890).

Almost surely, 2^51423742890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51423742890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73878456960).

51423742890 is an abundant number, since it is smaller than the sum of its proper divisors (96333171030).

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

51423742890 is a wasteful number, since it uses less digits than its factorization.

51423742890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7813 (or 7807 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 51423742890 in words is "fifty-one billion, four hundred twenty-three million, seven hundred forty-two thousand, eight hundred ninety".