51047772 has 36 divisors (see below), whose sum is σ = 123541320. Its totient is φ = 16386272.

The previous prime is 51047671. The next prime is 51047779. The reversal of 51047772 is 27774015.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51047779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133093 + ... + 133475.

Almost surely, 2^51047772 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 51047772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61770660).

51047772 is an abundant number, since it is smaller than the sum of its proper divisors (72493548).

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

51047772 is a wasteful number, since it uses less digits than its factorization.

51047772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 13720, while the sum is 33.

The square root of 51047772 is about 7144.7723546660. The cubic root of 51047772 is about 370.9587310576.

The spelling of 51047772 in words is "fifty-one million, forty-seven thousand, seven hundred seventy-two".