51772656 has 80 divisors (see below), whose sum is σ = 149052960. Its totient is φ = 15375360.

The previous prime is 51772649. The next prime is 51772687. The reversal of 51772656 is 65627715.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

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, 16666 + ... + 19526.

It is an arithmetic number, because the mean of its divisors is an integer number (1863162).

Almost surely, 2^51772656 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 51772656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74526480).

51772656 is an abundant number, since it is smaller than the sum of its proper divisors (97280304).

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

51772656 is a wasteful number, since it uses less digits than its factorization.

51772656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914 (or 2908 counting only the distinct ones).

The product of its digits is 88200, while the sum is 39.

The square root of 51772656 is about 7195.3218135119. The cubic root of 51772656 is about 372.7063697397.

The spelling of 51772656 in words is "fifty-one million, seven hundred seventy-two thousand, six hundred fifty-six".