51612452840 has 64 divisors (see below), whose sum is σ = 125463461760. Its totient is φ = 18995569920.

The previous prime is 51612452821. The next prime is 51612452861. The reversal of 51612452840 is 4825421615.

It is a happy number.

It is a super-2 number, since 2×51612452840² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51612452794 and 51612452803.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2147 + ... + 321293.

It is an arithmetic number, because the mean of its divisors is an integer number (1960366590).

Almost surely, 2^51612452840 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 51612452840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62731730880).

51612452840 is an abundant number, since it is smaller than the sum of its proper divisors (73851008920).

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

51612452840 is a wasteful number, since it uses less digits than its factorization.

51612452840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319482 (or 319478 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 51612452840 in words is "fifty-one billion, six hundred twelve million, four hundred fifty-two thousand, eight hundred forty".