51761556 has 144 divisors (see below), whose sum is σ = 166053888. Its totient is φ = 13204800.

The previous prime is 51761543. The next prime is 51761581. The reversal of 51761556 is 65516715.

It is a super-2 number, since 2×51761556² = 5358517359082272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51761556.

It is a congruent number.

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, 196681 + ... + 196943.

It is an arithmetic number, because the mean of its divisors is an integer number (1153152).

Almost surely, 2^51761556 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 51761556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83026944).

51761556 is an abundant number, since it is smaller than the sum of its proper divisors (114292332).

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

51761556 is a wasteful number, since it uses less digits than its factorization.

51761556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362 (or 357 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 51761556 is about 7194.5504376577. The cubic root of 51761556 is about 372.6797318919.

The spelling of 51761556 in words is "fifty-one million, seven hundred sixty-one thousand, five hundred fifty-six".