51777726 has 128 divisors (see below), whose sum is σ = 143410176. Its totient is φ = 12026880.

The previous prime is 51777721. The next prime is 51777743. The reversal of 51777726 is 62777715.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51777721) 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, 222106 + ... + 222338.

It is an arithmetic number, because the mean of its divisors is an integer number (1120392).

Almost surely, 2^51777726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51777726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71705088).

51777726 is an abundant number, since it is smaller than the sum of its proper divisors (91632450).

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

51777726 is a wasteful number, since it uses less digits than its factorization.

51777726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306.

The product of its digits is 144060, while the sum is 42.

The square root of 51777726 is about 7195.6741171345. The cubic root of 51777726 is about 372.7185354900.

It can be divided in two parts, 51 and 777726, that added together give a palindrome (777777).

The spelling of 51777726 in words is "fifty-one million, seven hundred seventy-seven thousand, seven hundred twenty-six".