51112620 has 144 divisors (see below), whose sum is σ = 173365920. Its totient is φ = 12566016.

The previous prime is 51112573. The next prime is 51112637. The reversal of 51112620 is 2621115.

It is a super-2 number, since 2×51112620² = 5224999846528800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 51112593 and 51112602.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62776 + ... + 63584.

It is an arithmetic number, because the mean of its divisors is an integer number (1203930).

Almost surely, 2^51112620 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 51112620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86682960).

51112620 is an abundant number, since it is smaller than the sum of its proper divisors (122253300).

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

51112620 is a wasteful number, since it uses less digits than its factorization.

51112620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846 (or 832 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 51112620 is about 7149.3090575244. The cubic root of 51112620 is about 371.1157457625.

Adding to 51112620 its reverse (2621115), we get a palindrome (53733735).

It can be divided in two parts, 511 and 12620, that added together give a palindrome (13131).

The spelling of 51112620 in words is "fifty-one million, one hundred twelve thousand, six hundred twenty".